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At a sporting goods store, sweatshirts are on sale for 30% off the regular price, r, in dollars. Lana has a coupon for $5 off any single item at the store. The expression 3(r – 0.3r) – 5 represents the total cost before tax if Lana buys 3 sweatshirts.

A3r-0.3r-5
B2.1r-15
C3(0.7r)-5
D3(r-0.3r-5)
E3r-0.9r-5


which ones show whether or not it represents the total cost before tax.

Verified Answer :

meerkat18

Given:
Regular price = r
discount rate = 30%
coupon = $5 off any single item at the store

expression: 3(r - 0.3r) - 5

C.) 3(0.7r) - 5 represents the total cost before tax.

3(r-0.3r) - 5 ⇒ 3(0.7r) - 5

The coupon can only be used once because the problem stated any single item not every single item purchased. 



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