If 60% A = 3/4 of B, then A : B is

Answer: Option B

$$\begin{array}{rl}& \text{60}\%\text{of}\text{A}=\frac{\text{3}}{\text{4}}\text{of}\text{ B}\\ & \Rightarrow \frac{60}{100}\text{A}=\frac{3}{4}\text{B}\\ & \Rightarrow \frac{\text{3}}{\text{5}}\text{A = }\frac{\text{3}}{\text{4}}\text{B}\\ & \Rightarrow \frac{\text{A}}{\text{B}}\text{ = }\frac{\text{3}}{\text{4}}\times \frac{\text{5}}{\text{3}}\\ & \Rightarrow \frac{\text{A}}{\text{B}}=\frac{5}{4}\end{array}$$
⇒ A : B = 5 : 4