Question

Ajay sold an article at 20% profit to balu. balu sold it at 30% profit to chetan. dinesh sold a similar article at 20% loss to david. david sold it at 30% loss to edward. the sum of the price that chetan and edward paid for their respective article is rs 28000 more than what ajay paid. if ajay and dinesh bought the article for the same price find the sum of the prices paid by ajay and dinesh for their respective articles

How to do an easy way
b = 1.20a
c = 1.30b

da = 0.80di
e = 0.70da

c+e = a+28000
a = di

Now just start substituting to find a+di

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