At the start of July, a colony of bacteria has a population of .
After hours, the population of the bacteria is .
The population of this colony can be calculated using the formula:
Practice IB Mathematics Analysis and Approaches (AA) Topic SL 1.4—financial Apps – Compound Interest, Annual Depreciation with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for SL 1.4—financial Apps – Compound Interest, Annual Depreciation and mirrors Paper 1, 2, 3 style where relevant.
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At the start of July, a colony of bacteria has a population of .
After hours, the population of the bacteria is .
The population of this colony can be calculated using the formula:
A fund receives a single contribution of amount at the end of each year for years. Interest rate is , compounded annually.
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A trust fund is established with an initial investment of $10,000. The fund earns compound interest at a rate of per year for the first years. After years, the interest rate changes to per year for the next years.
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An investment grows by each year, with interest compounded annually. Its doubling time is years.
Investors estimate the doubling time by years for a fixed constant , the familiar choice being .
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where is the population of the bacteria hours after the start of July.
Find and , then the population of the bacteria after hours from the start of July.
Give your answer correct to the nearest integer.
An investor has two options:
Option 1: Invest $ at an annual compound interest rate of . After years, the investment grows to $.
Option 2: Invest $ at an annual compound interest rate of , compounded semi-annually.
the value of , correct to decimal places, such that the value of the investment under Option 2 after years is equal to the value of the investment under Option 1 after years.