Percentages Challenging Exercise
1. In a month, Janet spends 64% of her salary and saves the rest. It is known that the savings is
$7 000 less than the expenditure in that month.
(a) How much is Janet's monthly salary?
I
(b) How much does she save in that month?
Explain 2. When a car is sold, the profit made is equal to 40% of the selling price of the car. Can we say
that the profit per cent is equal to 40%? Explain your answer.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Which expressions are equivalent to -7+3(-4e-3)? choose all answers that apply: choose all answers that apply: a -4(3e+4)? 4(3e+4) b 12e12e c none of the above

Select all the statements that apply to this figure