Question

An ointment contains 1% w/w calamine., Which of the following is the amount of calamine powder that should be added to 200 g of the ointment to produce a 4% w/w calamine ointment?​

Answer 1

Answer:

8g

Explanation:

in 200 g ointment 1%calamine is already present so take out the w/w of 1%calamine and and ³%calamine and add them