Money maths

Interest, profit and loss the way exams ask for them.

• 1Averages without adding everythingPick a middle number and only average the small differences. 3 practice questions+20 XP
• 2Simple interest in one linePrincipal times rate times time, all over a hundred. 3 practice questions+20 XP
• 3Profit and loss percentageAlways divide by the cost price — never by the selling price. 3 practice questions+20 XP