Which is the better investment: 9% stock at Tk 90 or 12% stock at Tk 120?

Question: Which is the better investment: 9% stock at Tk 90 or 12% stock at Tk 120?

Solution:
→ Yield of 9% stock = (9 / 90) × 100 = 10%
→ Yield of 12% stock = (12 / 120) × 100 = 10%
On every taka you put in, both give the same 10 % return.
correct answer: Both are same