Ans: (a) $\$97$ (b) Yes
- The estimated total amount
$\begin{array}{cl}
= & 9 \times 4 + 17 \times 3 + 5 \times 2 \\
= & \$ 97
\end{array}$ - Since the result of (a) is come from rounding up the unit price of each item, then the actual amount John should pay is less than $\$ 97$. Therefore, John has enough money to buy all items.
