Why is it important to be able to calculate percentages?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

The product of sin 30 degrees and sin 60 degrees is same as the product of