Real-Life Math -- Solution
You're an on-site property manager at an office building. You're
preparing an invoice for light bulbs for one of your tenants.
First,
determine how much each light bulb costs:
Twelve halogen
light bulbs cost $49.95. 49.95 / 12 = 4.16
Fluorescent tubes
cost $2.95 each
Three standard incandescent light bulbs cost
$6.75. 6.75 / 3 = 2.25
Next, determine the total for
each type of light bulb:
Halogen: 21 * $4.16 = $87.36
Fluorescent
tubes: 13 * $2.95 = $38.35
Standard incandescent: 16 * $2.25
= $36.00
Subtotal the cost of light bulbs before tax:
$87.36 + $38.35 + $36.00 = $161.71
Now
add 5 percent sales tax:
$161.71 * 0.05 = $8.09
Finally,
add the tax to the subtotal for the grand total:
$161.71
+ $8.09 = $169.80
Here's the invoice you could prepare:
21 halogen light bulbs at $4.16 each = $87.36
13
fluorescent tubes at $2.95 each = $38.35
16 standard incandescent light
bulbs at $2.25 each = $36.00
Subtotal for light bulbs
= $161.71
Sales tax (5%) = $8.09
Grand total = $169.80
"Everything
is very basic math or templates you plug numbers in to. There's no algebra,"
says Kristy Ludwar. She's an on-site property administrator at a large office
building.