Since 3 neckties will be out from the store, so you need to know how much is the cost of 3 ties.
$59.99 x 3 = $179.97 and divide it by two because the costumer will only pay for 2
$179.97 / 2 = $89.99 is the new price
Mark up = 89.99 – 59.99 = $30.00
% mark up = [(89.99/59.99) -1] * 100
= 50%