1. Let’s denote the initial number by the letter A. If we decrease it by 50%, then it becomes equal in percentage terms:
100 – 50 = 50%.
2. Now let’s find how much remains of the number after decreasing it by that much:
100% – A;
50% – H.
X = A x 50/100;
X = 0.5 x A.
3. If the number increases by 80%, then it becomes equal in percentage terms:
100 + 80 = 180%.
4. Now 100% of the number is 0.5 x A, and how much is 180%, we will solve using the method of proportions:
100% – 0.5 x A;
180% – W.
Y = 0.5 x A x 180/100;
Y = 0.9 x A.
Answer: if you do the above procedures with the number, it will become equal to 0.9 x A.
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