A piece of cloth 5 m long shrinks 10 per cent on washing. How long will the cloth be after washing ?
Cloth's length $$= 5\,meter$$
Percentage of shrinkage after washing $$= 10\%$$
Hence, length of cloth, after washing
$$= 5 - 10\% \,of \,5$$
$$= 5 - \dfrac{10}{100} \times 5$$
$$= 5 - 0.5$$
$$= 4.5\,m$$