Question 1206266
he gained 10% on one of them.
x + .10 * x = 1200
combine like terms to 1.10 * x = 1200
solve for x to get x = 1200 / 1.10 = 1090.909091

he lost 10% on the other of them.
x - .10 * x = 1200
combine like terms to get .9 * x = 1200
solve for x to get x = 1200 / .9 = 1333.333333


x represents the cost.
total revenue is 2400
total cost is 2424.242424


revenue / cost = 2400 / 2424.242424 = .99


greater than 1 he made a profit.
less than 1 he took a loss.


1 - .99 = .01 = 1% loss.


he took a loss of 1%.