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Ratios, Percentages, and Proportions Videos 55 videos

GED Math 2.1 Expressions and Equations
216 Views

In this GED math problem, figure out what fraction of Serena's monthly income is spent on groceries

GED Math 1.3 Expression and Equations
1525 Views

Pick the expression that best represents the cost in dollars of riding m miles in a taxi.

SAT Math 10.3 Geometry and Measurement
3336 Views

SAT Math 10.3 Geometry and Measurement. What is the ratio of birds to dogs?

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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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