00:01
All right so problem one ninety seven we're calculating um the money in annie's paycheck right we are told that she works two jobs she tutors for fourteen dollars an hour and she also works at a coffee shop for 875 an hour and she tutored for eight hours and work at the coffee shop for 15 hours right so in order to calculate how much she earned from tutoring we got to multiply 14 .04 times 8 and similarly if we want to calculate how much she earned from the coffee shop you got a multiply multiplied multiplied 875 by 15 okay so i'll go and rewrite our setup we got eight hours times $14 .4 and that is for the tutoring and we're adding that to 15 hours times $8 .75 for working at the coffee shop.
01:22
Okay? so let's go for it and start with her earnings for tutoring.
01:32
We got 14 .04 times 8 .04.
01:41
4 times 8 is 32, so i write 2 and carry over 3.
01:46
0 plus 8, 0 times 8 is 0, plus 3 is 3, 4 times 8 is 32, so i write 2 and carry over 3.
01:57
1 times 8 is 8 plus 3 is 11.
02:02
So next is counting the decimal places.
02:08
We got 1, 2, 14 .04.
02:13
For eight is a whole number so we don't have decimal places from there so we need two on our answer so one two and that's where we put our decimal point right she earned 112 and 32 cents for tutoring for eight hours next is working at the coffee shop so we got 8 .75 times 15 hours.
02:53
Okay, so 5 times 5 is 25.
02:57
So i write 5 and carry 2 over 7 times 5 is 35 plus 2 would be 37.
03:09
Carry over 3.
03:12
8 times 5 is 40 plus 3 is 43.
03:16
Next we got 1 right here.
03:22
So 1 times 5 is 5.
03:25
1 times 7 is 5.
03:26
1 times 7 is 7 and 1 times 8 is 8.
03:31
So next is we add these two digits.
03:35
You bring down 5.
03:38
7 plus 5 is 12.
03:43
So i write 2 and carry 1 over.
03:47
So 1 plus 3 plus 7 gives us 11.
03:53
So i write 1 and carry 1 over.
03:56
And i got 1 plus 4 plus 8, which is 13.
04:01
So we write 13.
04:04
And last step is to count the number of decimal places we got one two so two from 875 and 0 from 15 so we need two decimal places let's go for it we got one two and that's where we put our decimal point so annie is earning one thirty one dollars and twenty five cents for working for 15 hours at the coffee shop so if we want to know how much he's earning in total we have to add 112 .32 and 131 .25 so let's go for it got 112 .32 plus 131 .25 so 2 plus 5 is 7 3 plus 2 is 5 you bring down that decimal point 2 plus 1 is 3 1 plus 3 is 4 and and finally, one plus one is two.
05:15
So there we have it.
05:18
That's the total that annie earned for working those two jobs.
05:24
She got $243 .57.
05:28
So that's for question a, right? but we are not done yet...