Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
1. Probability
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Exercise 2 Page 288

Use the simple interest formula I=prt, where I is the interest, p the principal, r the annual interest rate, and t the time in years.

$ 78

Practice makes perfect
If we deposit money in a savings account, the bank pays us interest for the use of our money. To calculate the interest I, we use the simple interest formula. I= p r t, where... I& =Interest p& = Principal r& = Annual interest rate t& = Time (in years)We made a deposit of $650 in a savings account with an interest rate of 2 % = 0.02. We want to calculate the interest — how much we will earn in 6 years. p= 650, r= 0.02, t= 6 To calculate the interest, we will substitute these values into the simple interest formula and evaluate the right-hand side.
I=prt
I=( 650)( 0.02)( 6)
I=13(6)
I = 78
The earned interest is 78 dollars.