1.

a man invested rupees 1000 simple interest at a certain rate and Rupees 1500 at 2% higher rate. the total interest in three years is rupees 390 .what is the rate percent for Rupees 1500?​

Answer»

Answer:

Step-by-step explanation:

LET RATE on P1 i.e( principal=Rs.1000) = R

and rate on  P2 i.e( principal=Rs.1500) = R + 2

[ from QUESTION we know that rate on principal of 1500 is 2% higher than the rate on principal of 1000]

Time = 3 years

According to question,

Then the INTEREST ratio is =\frac{1000*3*R}{100} +\frac{1500*3*(R+2)}{100} = 390    

SOLVING the equation,we will get:⇒ 3000R +  4500R+ 9000= 39000

                                                       ⇒   7500R=30000

The rate on the principal of 1000 ⇒   R=4

Now the rate on the principal of 1500 is R+ 2 = 4+2 = 6


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