Question: If the simple interest on a sum of money for 3 years is $180 at a rate of 5% per annum, what is the principal amount?
Options:
Correct Answer: $1200
Solution:
SI = P × R × T / 100. 180 = P × 5 × 3 / 100. P = (180 × 100) / (5 × 3) = $1200.