Answer:
31.2 dollars.
Explanation:
We know that
1 dime = $0.1,
1 quarter = $0.25,
10-dollar bill = $10.
Therefore, three 10 dollar bills are worth $30, 2 quarters are $0.50, and 7 quarters are $0.7; hence, their combined worth is
$30 + $0.50 + $0.7 = $31.2
Hence, Adding 2 quarters to three 10-dollar bills and 7 dimes gives $31.2 dollars​