The original price is 218, the current price is 188, and the profit margin is 16%. How to calculate this? What's the formula

The original price is 218, the current price is 188, and the profit margin is 16%. How to calculate this? What's the formula

(218-188)/188=16%(15.96%)

Growth percentage formula, for example: last year, the price of soybeans was 5.65 yuan per catty, but this year, the price increased by 20%. What is the price? Calculation formula?

=5.65*(1+20%)
=5.65*1.2
=6.78

It is known that the original price of 450 is doubled = 900 plus 10%, 45 = 945, and the formula for calculating the original price is worked out

Original price
= 945 / 2.1
=450 yuan