On three tests you earned grades of 88%,94% and 90%. Each test was worth 150 points. The final exam is worth 250 pts. How many pts do you need on the final exam to earn 93% of the total points on tests? What percent do you need on the final?
(.88*150) + (.94*150) + (.90*150) + x = (.93*700)
Solve for x.