Question

The mass of a patient decreased by 20 percent every month. If his mass before the decrease was 90kg, how many kilograms had he lost after 3 months ?

Answer 1

Answer: 46.08 kg

Answer:

$90 \div 100 \times 20 = 18$

$90 - 18 = 72$

$72 \div 100 \times 20 = 14.4$

$72 - 14.4 = 57.6$

$57.6 \div 100 \times 20 = 11.52$

$57.6 - 11.52 = 46.08$

Step-by-step explanation:

Theres probably a better solution but brute force is sometimes good enough