Stock market 2

For the week of July 22, the following day to day changes in the stock market was recorded a certain stock: -2 on Monday; +4 Tuesday; -8 Wednesday; + 2 1/2 Thursday; - 3 1/4 Friday. The stock began the week at 78 points. How many points did it finish with at the end of the week?

Correct result:

a5 =  68.75


a0=78 a1=a02=782=76 a2=a1+4=76+4=80 a3=a28=808=72 a4=a3+(2+12)=72+(2+12)=1492=74.5 a5=a3(3+14)=72(3+14)=2754=68.75

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