Question

This question is from which book help me :Due to increase of 30% in price of colour TV the sale is reduced to 40% then what will be the percentage of change of income

Answer 1

78 %

actually income 100% =100x

due to price increase 30%

income =130x

reduced 40% =40/100(130x)=52x

now income =130x-52x=78x

percentage of income =78%