Exercise 24

1. The first figure is the cost price and the second figure is the selling price. Calculate the percentage profit or loss in each case.

a) $20, $25
b) $400, $500
c) $60, $54
d) $9000, $10 800
e) $460, $598
f) $512, $550.40
g) $45, $39.60
h) 50c, 23c
can someone explain this question to me ?? I have the solution but I couldn't understand how to solve it ...​