If Nigel had earned one fourth of a percent more in annual interest on an investment, the interest for one year would have been $45 greater. How much did he invest at the beginning of the year?
Note: If you enjoyed this question, try Nigel's Investment 2 .
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let x+0.0025x=x+45, then x+0.0025x-x=45, next 0.0025x=45, then x=45/0.0025, finally x=18000