1. The problem statement, all variables and given/known data A briefcase was sold at a profit of 10%.If the cost price was 5% less and it was sold for $ 7 more , the gain would have been 20% .Find the cost price of briefcase. 2. The attempt at a solution I assumed cost price to be x for 10% gain selling price would be 11x/10 & for 20 % gain selling price would be 6x/5 and profit would be x/5 by the condition 3x/20 +7= x/5 =>where x= 140 But the book's answer is $175 I don't know where i am going wrong and also each time the answers are coming different. Please help me to rectify where i am going wrong . thank you.