Applications of Logarithms: Compound interest
Applications of Logarithms: Compound interest
Applications of Logarithms: Compound interest
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Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
Applications of Logarithms: Compound interest
2/8
Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
After 0 months: 2$
Applications of Logarithms: Compound interest
2/8
Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
After 0 months: 2$
After one month the bank multiplies adds .05 of your money back into the account
You have 2 + .05 ? 2 = 2.1: You gained a dime!
Applications of Logarithms: Compound interest
2/8
Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
After 0 months: 2$
After one month the bank multiplies adds .05 of your money back into the account
You have 2 + .05 ? 2 = 2.1: You gained a dime!
Notice that adding .05 of your money back into the account is the same as multiplying by 1.05.
Applications of Logarithms: Compound interest
2/8
Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
After 0 months: 2$
After one month the bank multiplies adds .05 of your money back into the account
You have 2 + .05 ? 2 = 2.1: You gained a dime!
Notice that adding .05 of your money back into the account is the same as multiplying by 1.05.
After 2 months the bank multiplies again by 1.05, giving you 2.1 ? 1.05 = 2.205 You gain another dime and a half penny!
Applications of Logarithms: Compound interest
2/8
Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
After 0 months: 2$
After one month the bank multiplies adds .05 of your money back into the account
You have 2 + .05 ? 2 = 2.1: You gained a dime!
Notice that adding .05 of your money back into the account is the same as multiplying by 1.05.
After 2 months the bank multiplies again by 1.05, giving you 2.1 ? 1.05 = 2.205 You gain another dime and a half penny!
In order to get to 12 months, you wind up multiplying by 1.05 12 times:
Applications of Logarithms: Compound interest
2/8
Compound interest
Suppose you put two dollar in the bank. The bank advertises an interest rate of 5% = .05 compounded every month. How much do you have after one year (12 months)
After 0 months: 2$
After one month the bank multiplies adds .05 of your money back into the account
You have 2 + .05 ? 2 = 2.1: You gained a dime!
Notice that adding .05 of your money back into the account is the same as multiplying by 1.05.
After 2 months the bank multiplies again by 1.05, giving you 2.1 ? 1.05 = 2.205 You gain another dime and a half penny!
In order to get to 12 months, you wind up multiplying by 1.05 12 times: After 12 months you have 2 ? 1.0512 3.5917.
Applications of Logarithms: Compound interest
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