Answer:
3200
Explanation:
So, 640 is 20% of this total
To find the total, first do 640 × 100 = 64000
Then do 64000 / 20 = 3200
To check, do 3200 * (20 / 100) = 3200 * 0.2 = 640
It checks out, so the price before the decrease was 3200
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