Otis monitors the number of strep infections reported in a certain neighborhood each week. According to his reports, infections ar

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Otis monitors the number of strep infections reported in a certain neighborhood each week. According to his reports, infections are growing at a rate of 28% per week. If the number of infections starts at 8 and continues to grow exponentially, what will the number of infections be in week 7

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  1. The number of infections in week 7 will be 45.

    What is the percentage?

    • A percentage is a figure or ratio stated as a fraction of 100 in mathematics.
    • The percent symbol, “%,” is commonly used, however the abbreviations “pct.”, “pct,” and sometimes “pc” is also used.
    • A % is a number with no dimensions; it has no unit of measurement.
    To find what will the number of infections be in week 7:
    • Week 1:  8/100 × 28 = 2.20 = 8 + 2.24 = 10.24
    • Week 2: 10.24/100 × 28 = 2.87 = 10.24 + 2.87 = 13.11
    • Week 3: 13.11/100 × 28 = 3.67 = 13.11 + 3.67 = 16.78
    • Week 4: 16.78/100 × 28 = 4.70 = 16.78 + 4.70 = 21.48
    • Week 5: 21.48/100 × 28 = 6.01 = 21.48 + 6.01 = 27.49
    • Week 6: 27.49/100 × 28 = 7.70 = 27.49 + 7.70 = 35.19
    • Week 7: 35.19/100 × 28 = 9.85 = 35.19 + 9.85 = 45.04
    Therefore, the number of infections in week 7 will be 45.
    Know more about percentages here:
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