Math Challenge March 14

There is a rumor that Einstein was not a good student. Determine what his grades were based on these test scores:
(a) In math his test scores were: 87%, 91%, 90%, 100%, 84%, 99%. What is his average in math?
(b) In science his test scores were: 82%, 100%, 75%, 100%, 99%, 102%, 100%. What is his average in science?
(c) In reading his test scores were: 66%, 110%, 90%, 87%, 88%, 95%, 100%, 100%, 99%. What is his average in reading?
(d) In social studies his test scores were: 100%, 88%, 99.5%, 105%, 100%, 99.5%, 74%. What is his average in social studies?