90 POINTS!! PLEASE HELP, IF YOU GIVE CORRECT ANSWER ILL GIVE YOU BRAINLIEST!!

Answer:
the answer is b
Step-by-step explanation:
you multiply 0.1% or 0.001 to 4200
the reason I am not multiplying 1.2% is because that is for yearly and 0.1% is for monthly
Answer:
A
Step-by-step explanation:
find 1.2% of £4,200 then multiply it