100% - 170% = -0.3%
* * * * *
Surely, 100% - 170% = -70%
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(20/100)170 = 34
170/100 * 97 = 164.9
To convert 170% to decimal notation divide by 100: 170% ÷ 100 = 1.7
170% means 170/100 = 1.7 1.7 * 230 = 391
It is 100*170/220 = 77.3% approx.