A tailor buys lining clothes from a wholesale merchant and cheats him by using a measurement tape which is 5 cm longer than the normal tape. The tailor offers the customers at cost price while stitching different garments and uses measurement tape which is 5 cm shorter than the normal tape. The gain percent is:
1
15%
2
\(10 \frac{10}{25} \%\)
3
10%
4
\(10 \frac{10}{19} \%\)