If you wish to calculate the interest on an investment with a rate of 3.58%, what number will you plug into your equation?

A percent means “per 100,” so convert 3.58% to a decimal by dividing by 100: 3.58 ÷ 100 = 0.0358. Plug in 0.0358, which is choice C. The number 0.358 would represent 35.8%, not 3.58%.

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