Question 639993
<pre>
When a number is increased by 20% it is multiplied by 100% + 20% or 120% or 1.2
When a number is decreased by 50% it is multiplied by 100% - 50% or 50% or 0.5

So when a number is multiplied by 1.2 and then multiplied by 0.5 it is
multiplied by 1.2×0.5 = 0.6 which is 60%

Edwin</pre>