Answer:
a) 40.80
Explanation:
let s = the cost spectacle clase
let g = the cost glasses
g + s = 108.80
s = .6g Substitute 06g for s in the first equation
g + .6g = 108.80 Combine like terms
1.6g = 108.80 Divide both sides by 1.6
g = 68.00
The glasses cost $68
g + s = 108.80 Substitute 68 for g to find s
68 + s = 108.80 Subtract 62 from both sides
s = 40.80
Check
g + s = 108.80
68 + 40.80 = 108.80 Checks
.6 x 68 = 40.8 If it is 40% off that means that 60% has remained.