Respuesta :
the total earning would be 100*8=800$
the least earning that he needs is 400$
so is we devide both sides with 8 we get the d
correct answer is d
the least earning that he needs is 400$
so is we devide both sides with 8 we get the d
correct answer is d
Answer:
50 ≤ x ≤ 100 shows the number of books he can sell.
Step-by-step explanation:
Let, y represents the amount he can earn by selling the books
Since, he wants to earn at least $ 400,
⇒ 400 ≤ y
Also, he has 100 book in which each costs $ 8,
Thus, maximum amount he can earn = The total cost of his books
= 8 × 100
= $ 800,
So, we can write,
y ≤ 800,
⇒ 400 ≤ y ≤ 800 ------(1)
Now, here, x represents the number of books he can buy in which each costs $ 8,
⇒ y = 8x
From equation (1),
[tex]400 \leq 8x \leq 800[/tex]
[tex]\frac{400}{8}\leq \frac{8x}{8} \leq \frac{800}{8}[/tex]
[tex]\implies 50\leq x \leq 100[/tex]
Which is the required inequality.