Converting answer in to percent

Use the markup equation
S = C + rC,
where S is the selling price, C is the cost, and r is the markup rate.

A set of golf clubs costing $650 is sold for $1105. Find the markup rate on the set of golf clubs.

what is the %

i got 455 but i don't know how to put that in %

You were on the right track but you simply did not finish solving the question.

S = C + rC
1105 = 650 + r * 650
455 = r * 650

As you can see, your solution of 455, is not the actual percentage but is actually the product of the markup rate and the cost. To find the markup rate, simply divide both sides by 650 in order to isolate r.

455 / 650 = r * 650 / 650
0.7 = r

You thus see that the markup rate is a decimal equal to 0.7.

In order to convert 0.7 to a a percentage, you need to find some number,
that when divided by 100 will give you 0.7.

0.7 = x / 100
0.7 * 100 = x / 100 * 100
70 = x

Therefore, after isolating for this number, you see that your solution is 70%.

S = C + rC (substitute 1105 for S and 650 for C)
1105 = 650 + 650r (subtract 650 from both sides)
455 = 650r (divide both sides by 650)
0.7 = r
r = 70% <===ANSWER

455 is the rc, to solve for r

rc = 455

r = 455/c: c = 650

r = 455/460 = .70 or 70%

1105=(1+r)650
r=1105/650-1=7/10=70%