The simple interest on a sum of money at 10% per annum for 6 year is half the sum. Then, the sum is?

Let the sum be Rs 'y'
Since Simple Interest = Rs ( y / 2)
and, T = 6 yr , R = 10% per annum
So Simple Interest, SI = (P x R x T)/100
where, R = Rate
T = Time
SI= Simple Interest
now, According to problem, ( y / 2 ) = ( y x 10 x 6)/100
⇒ (1/2)=(6/10)
⇒ which is not true, so it is not a possible case.