Elitmus Exam Numerical Ability Simple & Compound Interest

the principal yeilds a compound interest of rs420 during the second year at 5% p.a is?

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ans is 8000.
using fraction method
5%=1/20
so
20 : 21
20 : 1
.................
400 : 21
21=420
then 400= 8000 ans
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Elitmus Other Question

on a certain principal the c.i compounded annually for the second year at 10% p.a is 132.what is the principal. the c.i on a certain sum of money at certain rate per annum for 2 years is 2050 and s.i on the same amount of money at the same rate for 3 years is rs3000.then what is the sum of money