Answer:
4.5 or 4.50 dollars
Explanation:
if we split 18.00 into
each part of the fraction would be 4.5 . or 4.50
mark pays 4.50
samuel pays 9.00
add those both and you'll get 13.50 $
now subtract 13.50 from 18.00 ( og price)
imran pays 4 . 5 0
hope this helped :p