If we were getting 60% discount early and then again we are receiving 20% discount for using credit card then it means that we are getting 80% discount.
Discount means the amount which is deducted by sellers from the amount to be payable by buyers.
Let the total price to be paid by us to store is $100.
Discount received because on purchase on sale day=100*60%
=60
Discount received due to use of credit card=100*20%
=20
Total discount received from store=60+20
=80
Percentage=80/100*100
=80%
Hence the total discount received by us from store is 80%.
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