D is the only one which would make sense :)
Answer:
The sale price was $67.20
Step-by-step explanation:
The sale price is 30% less than the original price. Symbolically,
Sale price: (100% less 30%) of $96, or
(1.00 - 0.30)($96), or 0.70($96) = $67.20
The sale price was $67.20
800+16x=720+21x
80+16x=21x
80=5x
X=16
So 16 hours :)
I don't know use a calculator
