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A part of monthly expenses of a family is constant and the remaining varies with the price of wheat. When the rate of wheat is Rs.250 a quintal,the total

monthly expenses of the family are Rs.1,000 and when it is Rs.240 a quintal, the total monthly expenses are Rs.980.Find the total monthly expenses of the family, when the cost of wheat is Rs.350 a quintal.


when the rate of wheat is 250 /quintal ...........monthly expense is 1000
and when the rate of wheat is 240/quintal ,.........monthly expense is 980
from this we know that when there is a rs 10 change in price of wheat....monthly expense changes by 20 

so if the rate of wheat is 350/quintal ....the monthly income will be 1000+(10*20)..
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