In a class of twenty students, 6 have an average of 40%, 8 have an average of 50%, while the other 6 have an average of 60%. What is the average score for the whole class?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?