My friend says its d or b
If a company makes two discounts with one being made first and then another, the equivalent discount is 37%.
<h3>What was the equivalent discount?</h3>
Assume that the price of a good in the company was $10.
The initial discount of 30% takes the price to:
= 10 x ( 1 - 30%)
= $7
Then there is a 10% discount:
= 7 x (1 - 10%)
= $6.30
The equivalent discount is:
= (10 - 6.3) / 10
= 37%
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It is given in the question that B is in between C and D.
Therefore

Substituting the given values of CB,BD and CD, we will get

Combining like terms, we will get

Now we need to move 4 to the right side by adding 4 to both sides, that is

Step-by-step explanation:
hope you can understand