If 80% of A is 40% of B, then B is what percent of A?

( 80/100) × A = ( 40/100 ) × B

Divide both sides by 40/100

( 80A/100 )÷( 40/100 ) = ( 40B/100 )÷(40/100 )

2A = B

Divide both sides by A

2A ÷ A = B ÷ A

2 = B/A

B/A = 2 × 100

B/A = 200 %

discount of 25% means you're paying (100% -25%) = 75% of the original price. An additional discount of 20% means you're paying (100% -20%) = 80% of the discounted price. In the end, you're paying

 $3.00*75%*80% = $1.80

The final price of the cereal is $1.80.

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