Please help. I think I know but I'd like to have it confirmed.

1 answer:

4 0

Part 1
$40 \times 10.5 = 402$
Part 2
$40 \times 10.5 + 5 \times 1.5 \times 10.5 \\ = 402 + 78.75 \\ = 480.75$

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