Percentage discount.

A stereo system that regularly sells for $240 goes on sale for $192 what is the percent discount

From jumpstart booklet grade 8

and

A sweater that was orginally $27.95 is on sale $19.99 estimate the percent discount

PLEase explain thanks

For the first one:

The difference between 240 and 192 is 48. So the question now becomes "48 is what percent of 240?" Can you take it from here?

thanks your the best