The store decreases its prices before the sale and then returns prices to their previous levels when sale is over.
a) If sale was 20% discount, by what percent are decreased prices raised after sale?
b) If sale was 25% discount, by what percent are decreased prices raised after sale?
c)If sale was 1/3 off a sale, by what percent are decreased prices raised after sale?
d) Generalize: After the discount of k off, where 0