The simple interest is Rs. 168 for 8 years at 4% p.a. Find the principal.

Correct option is D

Given:
SI = 168
Rate = 4%
Time = 8 years
Formula Used:
​$$SI = \frac{P \times R \times T}{100}\\\ \\\Rightarrow P = \frac{SI \times 100}{R \times T}$$​​
Solution:
​$$P = \frac{168 \times 100}{4 \times 8}= \frac{16800}{32}= 525$$​​
Principal = Rs. 525
Alternate Solution:
Interest per year = 4%
→ 32% for 8 yrs

So 32% = 168
1% =$$\frac{168}{32}$$​
P = 100% × $$\frac{168}{32}$$​= 525