Question

A person invests one third of total principal at 7% per annum, one -fourth part at 8 % per annum and remaining part at 10% per annum simple interest. if total simple interest in one year is Rs 510 find the total investment.​

Answer 1

Answer:

470

Step-by-step explanation:

At 7%

S=4/12p(1+.07)^1

S=.357p

At 8%

S=3/12p(1+.08)^1

S=.257p

At 10%

first p=1-(3/124+4/12)

p=5/12

now find S

S=5/12p(1+.10)

now given total simple interest

S=4/12p(1.07)+3/12p(1.08)+5/12p(1.10)

510=1.085p

470=p

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