Aptitude - Simple Interest - Discussion

Here in the first case;

P * 7 * R/100 = 1750 -----> (1)
And in the second case interest is increased by 2%( Rate of interest).

P*7*(R+2)/100=? -------> (2)

HERE THE Rate of Interest is R+2 because the 100 in the demo is for the Rate of Interest Calculation i.e., R/100 is R%.

So, by the two equations, we get 3 unknown values. But to solve 3 unknown values we need 3 equations. hence there is no solution for this question unless one of the 3 unknown values is given.

Here in the first case;

P * 7 * R/100 = 1750 -----> (1)
And in the second case interest is increased by 2%( Rate of interest).

P*7*(R+2)/100=? -------> (2)

HERE THE Rate of Interest is R+2 because the 100 in the demo is for the Rate of Interest Calculation i.e., R/100 is R%.

So, by the two equations, we get 3 unknown values. But to solve 3 unknown values we need 3 equations. hence there is no solution for this question unless one of the 3 unknown values is given.

We can find the principle by using this formula but we need to assume the interest rate.
P = si/(r*t).

It's not 35,

Here its written, the rate increased 2% more means, new rate= (R+2) not (102R/100) ,

So, the answer cannot be found unless we have the principal.

I think the answer should be 35. I am not getting why they are saying data inadequate.

Old interest=(P*R*7)/100= 1750.

New interest= [P*R*7*(102/100)]/100.
=[(P*R*7)/100]*[102*100].
=1750*(102/100),
=1785.

So, the answer is = New Interest- Old interest = 1785 - 1750 = 35.

r is rate of interest.

Increased rate of interest is 1.02r because increased rate is 2%= (2÷100).
p*7*r=1750*100 ==> eq 1.
p*7*1.02*r=(1750+x)100==> eq 2 (x is incresed rs).
eq1& 2 is written as below.
7pr=175000 ==>eq 3.
7.14pr=175000+100x==> eq 4.

Upon solving both eqn 3*4.
0.14pr=100x==>eq 5.
by solving eqn 1 we get pr=25000.
By substituting that in eq 5.
0.14*250 = x.
so, x = 35.

As per my knowledge answer is 245.

SI for 7 years =1750.
RoI increases 2% means 7years *2% =14% increased so;
100% ------ 1750 means,
114% ------ =( 1750*114) /100 = 1995,
Interest increased = 1995-1750 = 245.

According to me, the correct answer is 35.

The Answer is 35.

Equation One = 7*P*R/100=1750
to be found (7*P*R+2)/100 = ?
we can rewrite as (7*P*R)100 + 2/100 = ?
and then 1750 + 2/100 = 35.

The answer cannot be determined because the principal is not given and we cannot assume rate r to be 100 or any value. Thanks.