Marcus is trying to decide whether he really needs to do his homework. There's a 50% chance that tomorrow he'll have a substitute teacher who won't collect the homework. Even if the normal teacher comes in, there's a 40% chance she'll give everyone an extension. Even if the whole class doesn't get an extension, there's a 20% chance Marcus can convince the teacher his dog ate his assignment and get a personal extension. What is the percentage chance that Marcus will actually have to turn in his homework tomorrow?
First find the chance that the normal teacher comes in by subtracting the odds she doesn't from 100%: 100% - 50% = 50%
Then find the chance the teacher doesn't grant the whole class an extension by subtracting the chance she does from 100%: 100% - 40% = 60%
Then find the chance that Marcus can't get a personal extension by subtracting the chance he does from 100%: 100% - 20% = 80%
Now find the chance the teacher comes in AND doesn't grant the whole class an extension by multiplying the two independent probabilities: .6 * .5 = <<.6*.5=.3>>.3
Now multiply that probability by the probability Marcus can't get a personal extension to find the probability he actually has to turn in his homework: .3 * .8 = <<.3*.8=.24>>.24
Finally, multiply the decimal probability by 100 to express it as a percentage: .24 * 100% = <<.24*100=24>>24%
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