Question

If `18` pen cost `$1.25`, then what is the cost of `60` dozens pen?

Answer 1

Total cost of `60` dozen pens is `$50`

Explanation:

One dozen pens mean `12` pens and hence `60` dozens pen mean `60xx12=720` pens.

As `18` pens cost `$1.25`

`1` costs `$1.25/18`

and `720` pens cost `$1.25/18xx720`

= `$1.25/cancel18^1xxcancel720^40`

= `$1.25xx40=$50`