On math queston explain all steps and include answer

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Lee has $1.75 in dimes and nickels. the number of nickels is 11 more than the number of dimes. how many of each coin does he have?