Jeanne babysits Chuy one day each week. Jeanne charges a 20...

Jeanne babysits Chuy one day each week. Jeanne charges a $\$ 20$ fee for the day, plus $\$ 5.50$ for every 30 minutes of babysiting. How much has Jeanne earied after three hours of babysiting? (Disregard the $\$$ sign when gridding your answer.)

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Key Concepts

Linear Equation

A linear equation in the context of cost calculations combines both fixed and variable fees into a single formula. It models the total cost as the sum of a constant fee and an amount that varies linearly with the quantity of usage or time.

Unit Rate

The unit rate is the cost assigned to a single unit of a metric, such as one time interval or one unit of usage. This concept is used to determine the total variable fee by multiplying the unit rate by the total number of units used.

Time Conversion

Time conversion involves translating time measurements between different units (for example, from hours to minutes or segments) to ensure consistency when applying rates or working with quantities that are based on specific time intervals.

Fixed Fee

A fixed fee is a constant charge that does not change regardless of the duration or quantity of service provided. It serves as the base cost in many pricing models and ensures that there is a minimum charge regardless of the variable components.

Variable Fee

A variable fee is an additional charge that increases in proportion to the amount of service or time used. It is calculated by multiplying a unit rate by the relevant measure, such as time or quantity, and reflects the incremental cost beyond the fixed fee.

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