Question 1128156


Monday ${{{540}}}
Tuesday ${{{455.50}}}
Wed ${{{365.50}}}
Thur ${{{330}}}
Friday ${{{x}}}

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if  the average daily balance of a customer checking account falls {{{below}}} ${{{500}}} (means must be less then {{{500}}}), then

${{{(540+455.50+365.50+330+x)/5<500}}}

${{{(x + 1691)/5<500}}}

${{{x + 1691<500*5}}}

${{{x  <2500-1691}}}

${{{x  <809}}}


 Friday balance must be less than ${{{809}}} to avoid the service charge.