The Total Job Takes 3

question 1

Multiple Choice

$\begin{array}{lcl}\text { Item } & \text { Quantity } & \text { Cost } \\5 / 8 \text {-inch hose } & 30 \text { inches } & \$ 1.25 \text { per foot } \\3 / 4 \text {-inch hose } & 24 \text { inches } & \$ 1.35 \text { per foot } \\5 / 8 \text {-inch hose clamps } & 2 & \$ 0.84 \text { each } \\3 / 4 \text {-inch hose clamps } & 2 & \$ 0.84 \text { each } \\\text { Thermostat with gasket } & 1 & \$ 5.65 \text { each } \\\text { Pressure cap } & 1 & \$ 4.50 \text { each } \\\text { Upper hose } & 1 & \$ 11.44 \text { each } \\\text { Lower hose } & 1 & \$ 16.53 \text { each } \\\text { Hose clamps } & 4 & \$ 0.98 \text { each }\\\\\text { Labor charges are as follows: }\\\\ \text { Remove, clean, and replace radiator } &&\$ 39.50 \\ \text { Reverse flush block } &&\$ 20.00 \\ \text { Replace heater hoses } &&\$ 10.00 \\ \text { Replace thermostat and cap } &&\mathrm{~N} / \mathrm{C}\end{array}$ The total job takes 3.5 hours. What is the average hourly cost of labor, to the nearest cent?

• A) $19.86
• B) $20.34
• C) $20.58
• D) $21.64

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Definitions:

Half-Life

The time required for half the quantity of a radioactive substance to undergo decay.

Half-Lives

The time required for half of the atoms in a radioactive sample to decay into other elements or isotopes.

Half-Lives

The time required for a quantity to reduce to half its initial value, commonly used in the context of radioactive decay.