Nabhitha has a loyalty card good for a 20% discount at her local pharmacy. What would her total in dollars and cents be, after the discount and before tax, if the total cost of all the items she wants to buy is 18.30?

Solution

N abhi t ha ha s a l oy a lt y c a r d g oo d f or a 20% d i sco u n t a t h er l oc a l p ha r ma cy . Wha t w o u l d h er t o t a l in d o ll a rs an d ce n t s b e, a f t er t h e d i sco u n t an d b e f ore t a x, i f t h e t o t a l cos t o f a ll t h e i t e m s s h e w an t s t o b u y i s 18.30 ?

Amount after discount : 14.64

Solution steps

Translate the problem into an equation:

x = 18.3 - 0.2 \cdot 18.3

x = 18.3 - 0.2 \cdot 18.3 : x = 14.64

Amount after discount : 14.64