In how many years will ₹ 950 produce ₹ 399 as simple interest at 7% ?

Find the time in which ₹ 1,200 will amount to ₹ 1,536 at 3.5% per year.

What sum of money borrowed on 24th May will amount to ₹ 10,210.20 on 17th October of the same year at 5 percent per annum simple interest?