Question

What is 20% of £4:50? How do you work it out?

Answer 1

£0.90

Explanation:

note that 20% =
`(20)/(100)` = 0.2

multiply £4.50 by 0.2 to obtain 20% of the quantity

£4.50 × 0.2 = £0.90

Answer 2

`Method\ \#1\\\\p\%=(p)/(100)\\\\20\%=(20)/(100)=(2)/(10)=0.2\\\\20\%\ of\ \£4.50\ is\ 0.2\cdot\£4.50=\£0.9\\\\Answer:\ 20\%\ of\ \£4.50\ is\ \£0.9.\\--------------------------\\Method\ \#2\\\\\begin{array}{ccc}100\%&-&\£4.50\\\\20\%&-&\£x\end{array}\qquad\text{cross multiply}\\\\100x=(20)(4.50)\\\\100x=90\qquad\text{divide both sides by 100}\\\\x=0.9\\---------------------------\\Method\ \#3\\\\\begin{array}{cccc}100\%&-&\£4.50&|\text{divide both sides by 5}\\\\20\%&-&\£0.9\end{array}`