The cost price of 6 pens is equal to the selling price of 4 pens. Find the profit percent.a.20%b.40%c.60%d.50%

Let's solve this step by step:

Step 1: Let's assume the cost price of one pen is $1. Therefore, the cost price of 6 pens would be$6.

Step 2: According to the problem, the selling price of 4 pens is also $6. So, the selling price of one pen would be$6/4 = $1.50.

Step 3: Now, we can calculate the profit by subtracting the cost price from the selling price. Profit = Selling price - Cost price = $1.50 -$1 = $0.50.

Step 4: The profit percentage is calculated by dividing the profit by the cost price and then multiplying the result by 100. Profit percent = (Profit / Cost price) * 100 = ($0.50 /$1) * 100 = 50%.

So, the profit percentage is 50%, which corresponds to option d.