The left side has 1 apple and 1 orange 0.45
the right side has 1 banana (0.25) and two strawberrys for 0.60
The right side cost is
0.25 + 0.60 = 0.85
The left side is apple + 0.45
So let cost of apple be "a", so we have the equation:

The apple costs $0.40