Chapter 12.7, Problem 51HP

To determine

To find :Choose the correct option.

Answer to Problem 51HP

Option D

Explanation of Solution

Given information :

We know that, cost of $4$ CDS is $d$ dollars.

Formula Used:

Unitary method

Calculation:

Cost of $\text{4}$ CDs = $d$

  $\therefore$ Cost of 1 CDs = $\frac{d}{4}$

So, cost of $\text{36}$ CDS = $36\times \frac{d}{4}=9d$

So, option D is correct answer.