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James invested a part of 150,000 peso at 7% and the remaining part at 5%. How much did he invest at 7% if he received a total interest of 10,000 pesos after a year?

Sagot :

JamieAnnidn
let x be the part invested at 7% and
150,000-x b invested at 5%

since p=br, then add the part invested at 7% and 5%, equate them to 10,000

therefore,
.07x+.05(150,000-x)=10,000
solve for x, and you'll arrive at
x= 125,000
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