X + y = 21
(x - y) = 2x - 6
Rewrite the first equation so that y = 21 - x
Now substitute y in the second equation, and solve for x.
Then solve for y
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Answer: A. 2.05 B. 5.10 C. 0
Explanation: Payback period can be defined as the period under which the profits or savings in an investment can recover the initial outlay invested in that investment. In simple words we can say that it is the time required by an investment to pay for itself.
Pay back period is computed as follows :-

therefore,
A.
=2.05years
B.
=5.10years
C.
=0
Answer:
option (c) $875 per year
Explanation:
Given;
Average cost of collision claims for careful drivers = $500 per year
Average cost of collision claims for for poor drivers = $3000 per year
Poor drivers known by the company = 15%
thus,
Careful drivers = (100% - 15%) = 85%
Therefore,
Insurance company's breakeven price for the collision insurance
= (Poor drivers known × Average cost of collision for poor drivers ) +( Careful drivers × Average cost of collision claims for careful drivers)
= 0.15 × $3000 + 0.85 × $500
= $450 + $425
= $875 per year
Hence, the correct answer is option (c) $875 per year