A man invested 24% of his income at a rate of 0.05% simple interest of the amount he invested for 45 years. If the man earns 120000 rupees, find the interest after 45 years, as a percentage of the amount he invested.

Here are some tips for simple interest:
Formula: The formula for simple interest is I = Prt, where I is the interest earned, P is the principal, r is the interest rate, and t is the time in years.
Time: Time can be calculated using the formula Time = Simple Interest ×100 / P × R.
Different rates: If the rate of simple interest differs from year to year, then Simple Interest = Principal × (R1+R2+ R3......)/100.