Answer :
100% are 75 marks because,30 + 30 = 60(40%+40%)then you have half 30 which is 15
60+15=74
you half the 40 and add 80 to 20
20+80=100 75 marks
hope this helped:)
60+15=74
you half the 40 and add 80 to 20
20+80=100 75 marks
hope this helped:)