(85 + h) = 74.90
Explanation:
74.90 is the price of bicycle AND helmet
together AFTER 30% discount.
Before discount bicycle was 85
.Before discount helmet was h
So sum is 85 + h
This sum should be discounted 30% to get our
discounted price (which is 74.9)
Discounting something by 30% means
multiplying that thing by 1 - 0.3 = 0.7
So now we have 0.7 multiplied with the sum of
85+ h,which will give us 74.9. This in equation
is
0.7(85 + h) = 74.90
Answer choice D is correct.