Question

Chair P, from Design Solutions, cost $60 per chair. Chair Q, from Seat Unlimited, costs $90 per chair. An office manager often has to buy several chairs to stock the floor space of new offices. On one occasion, she orders p of chair P, and q of chair Q. The average cost of a chair would be_________.

Answer 1

Answer:

$\frac{\ 60p+\ 90q}{p+q}$

Explanation:

Data provided in the question:

Cost of chair P = $60

Cost of chair Q = $90

Number of chair P ordered = p

Number of chair Q ordered = q

Now,

Total number of chairs ordered

= Number of chair P ordered + Number of chair Q ordered

= p + q

Total cost of chairs ordered = $60p + $90q

Therefore,

Average cost of a chair

= [Total cost of chairs ordered ] ÷ [Total number of chairs ordered]

= $\frac{\ 60p+\ 90q}{p+q}$