Answer :

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

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