Respuesta :
Let the number of shirts be x, and the jeans be y.
Total cost of shirts = 12x
Total cost of Jeans = 28y
This means that: Â Â Â Â 12x + 28y = 3900..........(a)
Selling price for Shirts 70% profit, means = 100% + 70% = 170% of the cost price
170/100 Â * 12x = 1.7*12x = 20.4xÂ
Selling price for Jeans 125% profit, means = 100% + 125% = 225% of the cost price
225/100 Â * 28y = 2.25*28y = 63y
Total profit = 3885, remember total cost = 3900
Total selling price = 3885 + 3900 = 7785
20.4x + 63y = 7785..........(b)
12x + 28y = 3900.............(a)
20.4x + 63y = 7785...........(b)
Solving the simultaneous equation with a programmable calculator:
x = 150, y = 75
150 shirts and 75 jeans.
Total cost of shirts = 12x
Total cost of Jeans = 28y
This means that: Â Â Â Â 12x + 28y = 3900..........(a)
Selling price for Shirts 70% profit, means = 100% + 70% = 170% of the cost price
170/100 Â * 12x = 1.7*12x = 20.4xÂ
Selling price for Jeans 125% profit, means = 100% + 125% = 225% of the cost price
225/100 Â * 28y = 2.25*28y = 63y
Total profit = 3885, remember total cost = 3900
Total selling price = 3885 + 3900 = 7785
20.4x + 63y = 7785..........(b)
12x + 28y = 3900.............(a)
20.4x + 63y = 7785...........(b)
Solving the simultaneous equation with a programmable calculator:
x = 150, y = 75
150 shirts and 75 jeans.
Let
x-------> Â the number of shirts
y------> Â the number of jeans
we know that
[tex]12x+28y=3,900[/tex] -------> equation [tex]1[/tex]
If she sold the shirts at [tex]70\%[/tex] profit and jeans at [tex]125\%[/tex] profit, her total profit was [tex]\$3,885[/tex]
so
[tex]1.7*(12x)+2.25*(28y)=3,900+3,885[/tex]
[tex]20.4x+63y=7,785[/tex] -------> equation [tex]2[/tex]
we have the following system of equations
[tex]12x+28y=3,900[/tex] -------> equation [tex]1[/tex]
[tex]20.4x+63y=7,785[/tex] -------> equation [tex]2[/tex]
using a graph tool
see the attached figure
The solution of the system is the intersection both graphs
the solution is the point [tex](150,75)[/tex]
that means
[tex]x=150\ shirts\\y=75\ jeans[/tex]
therefore
the answer is
the number of shirts is [tex]150[/tex]
the number of jeans is [tex]75[/tex]