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the rainfall total two years ago was 10.2 inches. Last year's total was 20/ greater. what was last year's rainfall total

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sparkyscout
10.2 inches would be 100%. To add 20% to that you would divide by 100, giving .102 inches. .102 in. is equivalent to 1%. Now, multiply by 100+percentage desired, in this case 20, giving 120
.102 x 120=12.24 inches