1. A lent 2000 to B for 1 year and 1000 to C for 2 years on simple interest at the same rate of interest and received 400 in all from both of them as interest. The rate of interest per annum is:
2. If the annual rate of simple interest increases from 5% to 7(1/2)%, a man’s yearly income increases by 750. His principal is:
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