The key here is knowing your percent formula, which is 𝘗=𝘉𝘹𝘙. You know that the rate is 65% and the base is 170. So plug in your two figures and then solve for the portion.
FYI, you first need to convert the rate into either a decimal or a fraction first. To convert a percent into a fraction, you divide the number by 100. And to make it a decimal, you'd do this division, which moves the decimal point two places to the left.
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