Question

change to give: $0.93
given: $0.00
received: $7.00
total: $6.07

Explanation:

Calculate the difference between received cash and total cost

$$ \text{Change} = \$7.00 - \$6.07 $$

Perform the subtraction

$$ 7.00 - 6.07 = 0.93 $$

Determine the optimal combination of coins for the change

$$
LATEXBLOCK0
$$

Answer:

\(3 \times 25\phi\), \(1 \times 10\phi\), \(1 \times 5\phi\), and \(3 \times 1\phi\)