Question

Please answer this question.1m of ribbon costs £3.20. find the cost of 1 and 1/4 m

Answer 1

`\begin{array}{ccc}1m&-&\£3.20\\\\1(1)/(4)m&-&x\end{array}\\-------------\\multiply\ on\ the\ cross\\-------------\\1\cdot x=1(1)/(4)\cdot3.20\\\\x=1.25\cdot3.20\\\\x=4\\\\Answer:\£4.00`