1.

The interest on 3000 for one year is 210. What is the interest on 4500 for a year? If one wantsto get an interest of 700, what should be the principal?​

Answer»

Given: (situation1)
P=3000
T=1 Year
R=?
S.I=210

S.I = PRT/100
210=3000xRx1/100
210=30R
R=210/30
R=7%

So, now we know the rate I.e 7%

Now to find the I on 4500 for 1 year

P=4500
T=1
R=7%

I=PRT/100
I=4500x1x7/100
I=315

Now if one wants to get an INTEREST of 700, what should be the P.....

I=700
R=7%
T=1
P=?

P=Ix100/RT
P=7x100/7x1
P=7000


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