In an annual sales contest, lisa sold $188, $212, $214, $196, and $200 worth of products in the first five years. in order to qualify for the grand prize, she must average at least $205 over six years. what is the least amount she must sell in the sixth year in order to qualify?

$220

Step-by-step explanation:

Formula to find Average :

Let x be the  amount she must sell in the sixth year in order to qualify.

Given : In an annual sales contest, Lisa sold $188, $212, $214, $196, and $200 worth of products in the first five years.

Then, the average over six years would be

In order to qualify for the grand prize, she must average at least $205 over six years.

i.e.

Hence, the least amount she must sell in the sixth year in order to qualify= $220

step-by-step explanation:

where is the questions

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional