Whoever answers 8-9 first correctly will get brainliest ! asap

Quadrilateral abcd is a parallelogram with diagonals that intersect at point e. which of the following statements is true?

Ashop has a sale that offers 20% off all prices. on the final day they reduce all the sale prices by 25% linz buys a ratio on the day. work out the overall percentage reduction on the price of the ratio

Me because i don't understand how to do it.: )