Question

An underground mine elevator descends 12% of the total depth every minute. The total depth of the elevator is 75 meters below the ground.

How many meters below the ground is the elevator after 2 minutes?

A: -18 meters
B: -9 meters
C: -4.5 meters
D: -22.5 meters

Answer 1

@vera_ewing can you please help me :) Please?

Answer 2

If it descends 12% of the total length in 1 minute, how much percent does it descend in 2 minutes?

Answer 3

24% @mathstudent55

Answer 4

Correct.
Now you need to find what 24% of 75 meters is.

Answer 5

What is
24% of 75 = ?
To find a percent of a number, divide the percent by 100 and multiply by the number.

24% of 75 =
= 24/100 * 75
= 0.24 * 75

Answer 6

which is 18?

Answer 7

@mathstudent55

Answer 8

so its -18?

Answer 9

Correct. It descends 9 m every min, so after 2 min, it's at the -18 m mark.

Answer 10

Thank you Guys Soooooo much I r
eally Apreciate it :) @mathstudent55 @jim_thompson5910

Answer 11

no problem

Answer 12

Yes, since 24% of 75 m is 18 m, it descends 18 m in the first two minutes.
Since it is descending, it is losing altitude, so you can call the displacement -18 m.
(Strictly speaking, the way the question was asked, the answer should be 18 m, not -18 m, but you don't have such a choice.)

Answer 13

You're welcome.