A merchant makes 20% instead of 40% on goods, because his "yardstick" is too long. What is the actual length of the yardstick? Thanks.
Since he is making: 1.2/1.4 =6/7% less because of his "yardstick" being too long, and since a yard = 36 inches, it therefore follows that his yardstick must be: 36 / (6/7) =36 x 7/6 = 42 inches.
