suppose you have 1200 rupees to save.you have save some amount at 10% and the rest at 15% .how much should be saved at each rate to yield 12%on total amount saved
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Total yield we want = 12 % of 1200 = 12 * 12 = 144
Let P be the amount saved at 10% and (1200 - P) will be saved at 15%
Total interest will be = 10*P/100 + 15 (1200 - P) /100 = 144
10 P + 18000 - 15 P = 14400
5 P = 3600
P = 720
So save 720 at 10% and 480 at 15%
Let P be the amount saved at 10% and (1200 - P) will be saved at 15%
Total interest will be = 10*P/100 + 15 (1200 - P) /100 = 144
10 P + 18000 - 15 P = 14400
5 P = 3600
P = 720
So save 720 at 10% and 480 at 15%
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