The cost of pair of jeans is $ 58
Solution:
Let "x" be the cost of 1 jean
Then, cost of pair of jeans = 2x
Let "y" be the cost of a top
Mari spent 81.18 on a pair of jeans and a top
Therefore,
2x + y = 81.18 ------ eqn 1
The top cost 80% of the cost of the jeans
cost of top = 80 % of cost of jeans
y = 80 % of x
y = 0.8x ---------- eqn 2
Substitute eqn 2 in eqn 1
[tex]2x + 0.8x = 81.18\\\\2.8x = 81.18\\\\x = \frac{81.18}{2.8}[/tex]
[tex]x = 28.99 \approx 29[/tex]
Thus cost of pair of jeans = 2x = 2(29) = 58
Thus cost of pair of jeans is $ 58
