Each week, mr. jones goes to the grocery store. mr. jones estimates that he will spend $120 when he goes to the grocery store this week. he actually spends $94. find the percent error.

Estimated amount that Mr. Jones thought would be spending each week for grocery = $120
Amount actually spent by Mr.Jones in the grocery store = $94
Error in calculation of the amount of spending = (120 - 94) dollars
                                                                           = $26
Percentage error in calculation = (26/120) * 100
                                                   = (13/6) * 10
                                                   = 130/6
                                                   = 21.666 percent
                                                   = 21.67 percent
So there is 21.67% error in the calculation of Mr. Jones. I hope you got the answer you were looking for.

Are you asking for 6 or 15?