Solve the investment problem. See Example 4. See the Strategy for Solving Word Problems box on page 91.
Danny’s dough. Danny invested some money at 3% simple interest and some money at 7% simple interest. The amount invested at the higher rate was $3000 more than the amount invested at the lower rate. If the total interest on the investments for 1 year was $810, then how much did he invest at each rate?
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