Henry and Walter open savings accounts at the same time. Henry invests $6,500 at 4.54% simple interest, and Walter invests $7,100 at 4.74% simple interest. After eight years, how much more interest has Walter earned than Henry?

Use the simple-interest formula I = Prt. Henry earns $6,500 × 0.0454 × 8 = $2,360.80, while Walter earns $7,100 × 0.0474 × 8 = $2,692.32. The difference is $2,692.32 − $2,360.80 = $331.52, so the correct choice is $331.52.

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