Question

at a simple interest 609 rupees becomes 812 in 4 years if the rate of interest was increased by 4% more how much will 750 become in 4 years​

Answer 1

Answer:

Rate of interest increased by 4% then the amount is Rs. 909

Step-by-step explanation:

Given: A simple interest 609 rupees becomes 812 in four years

To find: Determine the amount if it increased rate at 4%

Solution

Principal = Rs. 609

Amount = Rs. 812

Simple Interest = Amount - Principal

Simple Interest = RS. 812 - Rs. 609

                         = Rs. 203

Time = 4 years

Rate = $\frac{203 * 100}{609* (4)}$

Rate = 8.3 %

Now ,

Principal  = Rs. 609

Rate of interest increased by 4 %

R = 8.3 +4

R = 12.3 %

Time = 4

Amount = 609 + $\frac{(609)*(12.3)(4)}{100}$

Amount = 609 + 300

Amount = Rs. 909

As a result the amount is Rs. 909

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Answer 2

Answer:

The amount will be Rs 1119.9

Step-by-step explanation:

it is given that,

principal= 609

amount = 812

time= 4years

simple interest= amount -principal

=812-609

=203

rate of interest =r%

using the formula,

simple interest= (principal*rate of interst*time )/100

203= (609*r*4)/100

(203*100)/(609*4) = r

100/12= r

r= 8.33%

now it is given that when the rate of interest is increased by 4% means

=(8.33+4)%

=12.33%

also new principal will be 750

time = 4years

amount= x

using the formula,

Simple interest=  (principal*rate of interst*time )/100

amount- principal=(principal*rate of interst*time )/100

x- 750= (750*12.33*4)/100

x-750= 369.9

x= 1119.9

The amount will be Rs 1119.9

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