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SAT Math 4.4 Numbers and Operations 188 Views


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Description:

SAT Math 4.4 Numbers and Operations

Language:
English Language

Transcript

00:02

And here's your math-y shmoop du jour...

00:04

Tiana's mom promises to pay Tiana to clean out the garage on a weekly basis.

00:09

She decides to pay Tiana $100 the first week,

00:12

and then 75% of the previous week's amount for each of the following weeks.

00:17

However, when the amount drops below $25, Tiana will earn a steady income of $25 per week.

00:24

How much will Tiana earn after 10 weeks?

00:27

Round to the nearest dollar. And here are the potential answers...

00:32

To start, we need to focus on the most important information: Tiana's weekly pay.

00:37

In the first week, she gets paid 100 buckaroos. In the following weeks, she'll get paid

00:42

75% of each previous week's pay.

00:44

When her salary drops below $25, she'll get paid a steady amount of $25.

00:49

The easiest way to solve this problem is to make a chart of how much she makes each week,

00:52

starting with week 1 and ending with week 10.

00:55

Week 1, she makes $100. Week 2, she makes $75, which is 75% of $100.

01:02

This pattern stays the same and by week 6, she's earning $25.

01:06

She will continue to make $25 for the next weeks till she hits 10 weeks.

01:18

Now that you've got a list of her salaries

01:19

over all 10 weeks, just add them up... and we get $430.

01:24

Choice E is the correct answer.

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