a dealer bought x pens at $27.?

Question

continuation from above.
he proposed to sell each pen at a profit of 50 cents.show that his proposed selling price for each pen, in dollars is $(54+x/2x).

Answer 1

If he bought x pens for $27, each pen costs 27/x. If he is proposing a $0.50 markup, then the cost for each pen will be 27/x + 0.5, or if you wanted to combine that, that would become:

27/x + 0.5 = 27/x + 1/2
= 54/2x + x/2x
= (54 + x)/2x

It's just a matter of combining fractions and getting common denominators.