Respuesta :
Answer:
The cost of the most expensive book which he can buy with his money is less than or equal to 43.5
Step-by-step explanation:
Given : I'm at a bookstore with $35 in my pocket and a 20%-off coupon.
To Find: . What is the cost of the most expensive book I can buy with my money and the coupon?
Solution :
let the cost of most expensive book be x
Since there is 20 % of on every book
So, After 20 % off on the most expensive
The cost will be : x - (x of 20%)
[tex]=x-\frac{20}{100} x[/tex]
[tex]=\frac{80}{100} x[/tex]
[tex]=\frac{4}{5} x[/tex]
Since we are given that he has only $35 so he cannot pay more than 35
so, equation becomes :
[tex]\frac{4}{5} x\leq 35[/tex]
[tex]x\leq\frac{5*35}{4} [/tex]
[tex]x\leq\frac{175}{4} [/tex]
[tex]x\leq43.5[/tex]
So , the cost of the most expensive book which he can buy with his money is less than or equal to 43.5
Answer:
$43.75
Step-by-step explanation:
Let x represent the cost of the book. We have a 20% off coupon; this means we will pay 100-20 = 80% of the cost.
80% = 80/100 = 0.8; this means we the cost we pay will be represented using the expression 0.8x.
Since we only have $35, this gives us the equation
0.8x = 35
Divide both sides by 0.8:
0.8x/0.8 = 35/0.8
x = $43.75
