Question

Seventy five ball pens cost $Rs637.50$. Find the price of $23$ ball pens. How many pens can be bought for $Rs800$ and how much money will be left?

Answer 1

Cost of $75$ ball pens $=Rs.637.5$

Cost of $1$ ball pen $=\frac{637.5}{75}=Rs.8.5$

Cost of $23$ ball pens $=8.5\times 23=Rs.195.5$

Now,

No. of pens in $Rs.637.5=75$

No. of pens in $Rs.1=\frac{74}{637.5}$

Therefore,

No. of pens in $Rs.800=\frac{75}{637.5}\times 800\approx 94$ pens for $Rs.799$.

$\therefore$ Remaining amount $=800-799=Rs.1$