13/15% of quantity is equal to what fraction of the quantity?

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?