For #7,
2 3/8% < 2 1/2% < 2 2/3% < 2 4/5%
For #8,
The answer is $80, here's how:
$32 = 40%
100% = ?
(I don't really know a way better than this, sorry, even tho I am sure of the answer)
40% ÷ 2 = 20%
32 ÷ 2 = 16
20% = 16
100% = 40% + 40% + 20%
100% = 32 + 32 + 16
100% = $80