A clock was sold for Rs. 144. If the percentage of profit was numerically equal to the cost price the cost of the clock was = ?

Answer: Option B

According to the question,
Selling price = Rs. 144
Cost price is equal to percentage of profit.
Note : In this type of question go through option.
Option = B
Cost price = Rs. 80
Profit % = 80%
Selling price
$$\begin{array}{rl}& =80+\frac{80}{100}\times 80\\ & =\text{Rs}\text{.144 (Satisfied)}\end{array}$$