Geography tests

On three 150-point geography tests, you earned grades of 88%, 94%, and 90%. The final test is worth 250 points. What percent do you need on the final to earn 93% of the total points on all tests?

Correct result:

p =  97.2 %

Solution:

 e1=150 88100=132 e2=150 94100=141 e3=150 90100=135  p100 250+e1+e2+e3=93100 (3 150+250)  b=93100 (3 150+250)e1e2e3=93100 (3 150+250)132141135=243  p=100 b250=100 243250=4865=4865%=97.2%



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