2. (4p) a) The cost of a blouse represents $30 \%$ of the cost of a dress, and $7.5 \%$ of the cost of a coat. What percent does the cost of the dress represent of the cost of the coat?

(3p) b) At a store, the price of a product increased by $25 \%$, then it was reduced by p\%, returning to the initial price. What percent does the reduction represent?

Doina Negrilă