Let the original capital be 1, and the calculation method is as follows:

1* (1-0.2) * (1-0.3) = 0.56, and the closing price on Wednesday is equivalent to 56% of the closing price on Monday.

(1-0.56)/0.56 = 0.785714 ..., the calculated increase is 78.57%, of which1-0.56 is the rising part, and 0.56 is the closing price of the previous day.