11. the sales tax rate is 6.9%
a. find the tax paid for a pair of boots with a list price of 128
b. what is the total cost of the pair of boot

a~8.83; 128.88
b~8.83; 136.83
c~0.88; 136.83
d~0.88; 128.88

40.1%

Step-by-step explanation:

I am assuming that 192 is in 100%.

100% = 192

I then represent the value that we are looking for with .

x% = 77

By dividing both equations (100% = 192 and x% = 77) and remembering that both left hand sides of BOTH equations have the percentage unit (%).

Now, of course, we take the reciprocal, or inverse, of both sides:

x = 40.1%

Thus making the 40.1% of 192 is 77.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: