Express the ratio 7day to 6weeks as a decimal fraction
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6 weeks=6*7 days=42days

7/42 =1/6 =0.16667

OR

7 days=1 week

therefore 1/6=0.16667

Note that both must be in the same unit.

Step-by-step explanation:

Given that the previous cost is

$216 per month

she expects an increase of 5% of the previous cost

therefore 5% of $216 is given as

=(5/100)*216

=0.05*216=10.8

Therefore she should be expected to pay extra $10.8 and the previous amount

hence the expected utilities each month is

=10.8+216=

=$226.8