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 answer:

p =  97.2 %

Step-by-step explanation:

e1=150 10088=100150 88=10013200=132 e2=150 10094=100150 94=10014100=141 e3=150 10090=100150 90=10013500=135  100p 250+e1+e2+e3 = 10093 (3 150+250)  b=10093 (3 150+250)e1e2e3=10093 (3 150+250)132141135=243  p=100 250b=100 250243=250100 243=25024300=5486%=97.2%

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