A7. After a $20 \%$ discount, the ski goggles cost 3000 tolars. How much did they cost before the discount at the regular price?
(A) 2400 SIT
(B) 3200 SIT
(C) 3600 SIT
(D) 3750 SIT
(E) 4250 SIT
A7. Let $x$ be the price before the discount. Then the price after the discount is $\frac{80 x}{100}=3000$ SIT, from which it follows that $x=3750$ SIT. The shoes cost 3750 SIT before the discount.