The price of tomato increases by 10%. The consumption of tomato decreases by 15%. What is the percentage change in the expenditure on tomatoes?

6.5% decrease

10% = \(\frac{1}{10}\) & 15% = \(\frac{3}{20}\)

Ratio of ,          Initial      :          New 

Price                  10         :           11

Consumption       20         :           17    

-------------------------------------------------------

Expenditure        200        :         187

{ Expenditure = Price × Consumption }

Percentage decrease in Expenditure = \(\frac{200 - 187}{200}\)×100

= \(\frac{13}{200}\)×100 

= 6.5% decrease