Sample response:
points of intersection represent when the price and profit are the same for each type of ball.
The intersection points are approximately
(8.16, 236.49) and (1.84, –16.49).
When the store charges $8.16 for each type of ball, they make the same profit from each ball, approximately $236.49.
Charging $1.88 provides no profit for either type of ball.
Part A
975 x 7%^m
350 - 7m
Part B
408
266
Part C
22 months
Answer:
That is an obtuse isosceles
The rule of 72 will have you divide 72 over the interest rate in percent form. Ignore the percent symbol
So we'll divide 72 over 8.47 to get...
72/8.47 = 8.50059
which is roughly 8.5 years for the money to double
If we round to the nearest whole number, then it takes 9 years for the money to double (according to the rule of 72). The year 1999 isn't listed so the next best choice is the year 2000. So I'm fairly confident the answer is C) 2000. Though your teacher may have 1998 in mind for some reason. If it were me, I'd go with 2000 because the year 1998 will have the account balance short of the goal of $10,000.
Answer: Choice C) 2000
