A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs. 6500?

Explanation:-

$$\eqalign{ & {\text{Total}}\,{\text{sale}}\,{\text{for}}\,{\text{5}}\,{\text{months}} \cr & = Rs.\,\left( {6435 + 6927 + 6855 + 7230 + 6562} \right) \cr & = Rs.\,34009 \cr & {\text{Therefore}}\,{\text{Required}}\,{\text{sale}} \cr & = Rs.\,\left[ {\left( {6500 \times 6} \right) - 34009} \right] \cr & = Rs.\,\left( {39000 - 34009} \right) \cr & = Rs.\,4991 \cr}$$