The simple interest at m% for m years will be Tk. m on a sum of?

Question: The simple interest at m% for m years will be Tk. m on a sum of?

Solution:
Given,
Rate of interest, r = m%
Interest, I = m Tk.
Time, n = m yeras.

We know,
I = Pnr
P = I/nr
= (m × 100)/(m × m)
= 100/m Tk.