Rolex buys computer disks at a price of 4 for $5 and sells them at a price of 3 for $5. how many computer disks must he sell to make a profit of $100

Given that Rolex buys computer disks at a price of 4 for $5 .

That means cost price of 1 disk = 5/4

Given that Rolex sells them at a price of 3 for $5.

That means selling price of 1 disk = 5/3

Profit on 1 disk = selling price - cost price

Profit on 1 disk

Profit on 1 disk

Profit on 1 disk

Profit on 1 disk

Now we have to find how many disk to be sold to get the profit $100

so we just divide $100 by profit on 1 disk

Hence final answer is 240 disks.

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: