Question

Katrin’s monthly payment for electricity went down from £38.60 to £34.20 she thinks this means that her monthly payment has gone by 1/6. Is katrin correct? Show how you think this?

Answer 1

Decreasing from £38.60 to £34.20 is a decrease of 38.60-34.20 = £4.40.  To find the ratio of decrease, we compare this to the original cost.
$\frac{4.4}{38.6} = 0.114 \\ \\ \frac{1}{6} = 0.1\bar{6}$
The bill did not decrease by 1/6.