The invoice weighs 4.2 oz. The first ounce is covered in the initial charge of $.37 and the rest of the 3.2 ounces must be calculated with the additional charge. For postage they round up to the next ounce so the 3.2 ounces rounds up to 4 ounces. An additional 4 ounces will cost $.92, 4 x $.23 = $.92. The total cost is $.37 + $.92 = $1.29.

Add up the various stages in order to figure out the total amount of time he must spend per tree;
20 min +120 min +40 min = 180 min or 3 hrs. It takes him 3 hours per tree and he has 6 trees to trim;
6 treesx 3 hrs/tree = 18 hrs total. He has 2 days to accomplish 18 hrs of work; 18 hrs/2 days = 9 hrs/day.

Multiply the total bill, t, by the decimal equivalent of 15%, 0.15. This expression is 0.151

The water heater is marked up 15% from $1,850, $1,850x 1.15 = $2,127.50,
and then discounted 25%, $2,127.50 x 75 = $1,595.63. The last piece is to add the tax, $1,159.63 x.065 = $103.72, To the total price, $1,595.63 + $103.72 = $1,699.35.

1. Find the excavation depth. It is the difference in site readings .85.
25' - 83.75' = 1.5'
2. Use the formula:
Excavation Depth (difference between the site readings) x Soil Slope
1.5 x 1.5 = 2.25'

Figure out the subtotal cost of the two hand saws;
$37.50 x 2 = $75.
To calculate the tax, translate_____is 8% of $75 into an equation:
y = .08 x $75. Solve y = $6 which represents the 8% tax. In order to find the total cost of the sweaters, add the 8% tax, $6, to the original price, $75;
$75 +$6 = $81.
To figure out the customer's change, subtract the total, $81, from the amount of cash given, $100;
$100-$81 = $19 change.

If a discount of 20% is offered, then the $35 quote represents 80% of the original price,
100%-20% = 80%.
Translate the following information into an equation to solve: 80% of the original price equals $35. Use p as the original price and solve the equation;
80/100 x p = $35; .80p = $35; .80p/.80 = $357.80; p = $43.75.

The fraction 1/10 is the same as 10%, 1/10 x 100 = 10%. 10% is the amount that is used; so 90% is available,
100%-10% = 90%.

To convert from a fraction to a percent, simply multiply the fraction by 100 and simplify, 3/4x 100 = 300/4 = 75%

Multiply 25 by the area of the lawn, 500 square feet; 25 x 500 = 12,500; 12,500 pounds are needed.

Use the conversion to calculate; if 1 lb = 16 oz, then multiply 34 by 16 to find the total number of 544 oz, 34 x 16 = 544. If each nail weighs 1 oz, there are 544 nails in a 34 lb box.

1. Calculate the effective length of rebar.
a. 30D indicates to multiply 30 x diameter of the rebar.
Convert the 3/4" fraction to a decimal.
3/4" = 0.75"
30 x 0.75 = 22.5"
b. Convert inches to feet. 22.5" / 12" = 1.875' (loss)
c. Subtract the loss from the length of the bar.
20' - 1.875' = 18.125'
2. Use the formula: Quantity x Length / Effective Length = # Rebars Needed
4 x 440' / 18.125' = 97.1 rebars (Round up to 98)

1. Calculate the material costs and labor savings for Type A Doors.
$400 x 6 = $2,400: material cost $20 x 6 = $120: labor savings
2. Calculate the material costs for Type B Doors.
$180 x 6 = $1,080: material cost
3. Calculate the total savings for Type A over Type B doors.
a. Subtract the labor from the material costs for Type A doors.
$2,400 - $120 = $2,280
b. Subtract the cost of Type B doors from Type A doors.
$2,280 – $1,080 = $1,200

To find the cost per grinder, divide the total cost, $900, by the number of grinders, 120; $900+ 120 = $7.50.

Since a post is needed for every four feet of fencing, divide the number of feet of fencing, f, by four to find the number of posts needed. The expression is f/4.