Answer:
$1.65
Explanation:
Equation: (x -0.10) + x = 3.40
Substitute: 2x-0.10 = 3.40
add 0.10 on both side: 2x = 3.50
divide: x =1.75
The second store charge $1.75 and the first store charged $0.10 less so it would be $1.65
$1.65 + $1.75 = $3.40 (total)