answer:a: 700b: he put the decimal point in the wrong place
part a: the problem 49/0.07 can be rewritten as 4900/7 by multiplying numerator and denominator by 100. then it is more clear that the correct answer is (49/7)×100 = 700.
part b: i've always had trouble reading marco's mind, so i cannot tell you what mistake he made. i can tell you the decimal point in his result is in the wrong place.
all of them.
every month has 28 days. some just continue on after reaching 28.
answer: he ended up with 35 points.
35-15-40+55 35-15=20 20-40=-20 -20+55=35
0.1515.. * 100 = 15.
0.1515.. * 1 = 0.
0. * 99 = 15
answer is 15/99.