d) As a smart consumer, you are always on the lookout for sales, coupons, and rebates. While shopping for new clothes, you notice that one particular brand of shirts is on sale for 20% off the original price. You also have a coupon for $10 off a $40 purchase. Coupons are applied after the 20% discount is taken. If each shirt originally costs $17.99, how many shirts would you need to buy to be able to use your coupon? Show your work

Answer:3 shirtsStep-by-step explanation:Each shirt costs originally $17.99 with a 20% discount.  This means that you are paying 80% of the original price.  The discounted price is $14.39.$17.99 × 0.80 = $14.39You need to buy enough shirts so that you spend at least $40.  You need to round up since you can't buy a fraction of a shirt.40 ≤ 14.39x40/14.39 ≤ (14.39x)/(14.39)2.779 ≤ x2.779 ≈ 3You will need to buy at least 3 shirts.