A computer is normally $550 but is discounted to $385 which precent of the original price does mark pay

70%

Step-by-step explanation:

We assume, that the number 550 is 100% - because it's the output value of the task.

We assume, that x is the value we are looking for.

If 100% equals 550, so we can write it down as 100%=550.

We know, that x% equals 385 of the output value, so we can write it down as x%=385.

Now we have two simple equations:

1) 100%=550

2) x%=385

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

100%/x%=550/385

Now we just have to solve the simple equation, and we will get the solution we are looking for.

Solution for 385 is what percent of 550

100%/x%=550/385

(100/x) * x = (550/385) * x - we multiply both sides of the equation by x

100=1.4285714285714*x - we divide both sides of the equation by (1.4285714285714) to get x

100/1.4285714285714=x

70=x

x=70