Question

The cost of production of each toy (in rupees) was found to be 55 minus the number of toys produced in a day. Let’s say $x$ toys were produced on a day, what is the total cost of production in terms of $x$?

• A. $x^2$ + $55x$
• B. $(x-55)(x+55)$
• C. $x^2$ - $55x$
• D. $55x$ - $x^2$

Answer 1

The number of toys produced on that day be $x$.

Therefore, the cost of production (in rupees) of each toy that day = $55–x$

So, the total cost of production (in rupees) that day =$x\times (55-x)$ = $55x$– $x^2$