manish sold an article for rs 2000 which he had brought for rs 2100 find his loss and its percentage

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

What is a rational number between 9.5 and 9.7

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?