let P = price paid for the phone
1.3P = 390
P = 300
let S = selling price
S = 0.8P = 0.8(300) = 240
Let the original price = $100, 30% high means marked price = $130
When marked price = $130 original price = $100
When marked price = $1 original price = $100/130
When marked price = $390 original price = $(100/130) x 390 = $300
Now he has to sell it for 20% less. 20% of 300 = 20 x 300 x 1/100 = $60
So he will get $240 for cellphone
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