Question 947244
The cost of using the oven is:
{{{ 189.43 }}} / month 
A month is {{{ 365/12 = 30.4167 }}} days/month
There are {{{ 7 }}} days/week
There are {{{ 30.4167/7 = 4.345 }}} weeks/month
So, the cost of the oven is:
{{{ 189.43 / 4.345 = 43.597 }}} cost/week
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{{{ C(x) = 43.6 + 1.18x }}}
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It might be good enough to say there are {{{ 4 }}} 
weeks/month and {{{ 189.43/4 = 47.36 }}} cost/week,
but it's not exactly true
Hope I got it