The price of sugar is decreased by 20%. If the expenditure on sugar is to be kept same then the ratio between increase in consumption to actual consumption will be:

1 :  4

Price × Consumption = Expenditure

*(If expenditure remains same the price is inversely proportional to consumption)

Therefore,

20% = \(\frac{1}{5}\)

Price ratio:         5     :     4

Consumption:    4      :     5

Hence,

                        Increase   :     Actual

Consumption:          1        :         4