b) The length, breadth and height of a room are 9 m 80 cm, 8 m 40 cm and 4 m 20 cm respectively. Find the longest tape which can measure the all three dimensions of the room exactly. ​

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x

he is going to fill two shelves and the third shelf will only have five video games

i think you would have to divide the money he had saved, which is $2,000 by the time he plans on exercising which is 40 hours, and the answer you get should tell you the answer to your question.

so mark-up is 0.4 multiplied by 180 = 72