Question

a rectangular piece of plastic sheet measures 1 m by 70 cm find its cost at the rate rupees 80 per square metre ?
solve the question and please show

Answer 1

70 cm = 0.7 m
area of rectangle
$1 \times 0.7 \\ 0.7m {}^{2}$
$80 \times 0.7 \\ 8 \times 7 \\ 56$
plastic sheet will cost 56.