Question

Express 30cm as a percent of 2m 40CM

Answer 1

2m 40cm= 240 cm (1 m =100 cm)

let x% of 240 cm be 30 cm

x/100 *240 =30

x= 30 *100/240

x=100/8

x=12.5

Answer 2

1m=100cm
2m=200cm
2m 40cm=240cm
percentage=30×100/240
percentage=12.5%