The cost of the goods was first increased by 10% and a month later they were reduced by 10%

The cost of the goods was first increased by 10% and a month later they were reduced by 10% as the cost of the goods changed in comparison with the original.

To solve this problem, remember, in order to find the percentage of the number, you need to multiply this number by the percentage and divide by one hundred. Let the initial price be x. Let’s increase it by 10%.
x + x * 10/100 = x + 0.1x = 1.1x.
The resulting price is 10% less.
1.1x – 1.1x * 0.1 = 1.1x – 0.11 = 0.99x.
Let’s calculate how much the cost of the goods has decreased.
x – 0.99x = 0.01x.
Answer: decreased by 0.01x.