When Xiao Pang calculates an addition problem, he regards a 3 on the decimal number as 5 and a 5 on the decimal number as 3, and the calculated sum is 98.76. Then,

Think of a 3 added in dozens of places as 5 and add 20.

The fifth place in the tenth place is regarded as 3, plus 0.2 less.

The calculated total is 98.76.

Correct answer: 98.76-20+0.2=78.96.

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