To find the number of units that gives break-even for the product, solve the equation R $$\mathbf { R } = \mathbf { C }$$ ound your answer to the
nearest whole unit.
-Roberto invested some money at 8%, and then invested $2000 more than twice this amount at 10%. His total annual income from the two investments was $3000. How much did he invest at 10%?
A) $22,000
B) $20,000
C) $6000
D) $2200

Question

Quizplus · Accepted Answer

To solve this, let the amount invested at 8% be x dollars. Then, the amount invested at 10% is 2x + $2000. The total income from these investments is given by 0.08x + 0.10(2x + 2000) = $3000. Solving this equation for x gives the amount invested at 8%, and then calculating 2x + 2000 gives the amount invested at 10%, which is $22,000.

To Find the Number of Units That Gives Break-Even for the Product