Question 261698
We put the total number of credits in the denominator (represents the whole), and the part that Tim earned, we put in the numerator.

56/64  
Now we divide (you can use a calculator) and we get .875  To figure out the percentage, we just move the decimal point over 2 places to the right, and we get 87.5%  If they want it rounded, then we would round up to 88%, because the last number is 5 or above.  If it were 4 or below, then we would have rounded down to 87%.