She has earned $31.05
Step-by-step explanation:
The formula of the simple interest is I = Prt, where
- P is the initial amount
- r is the interest rat in decimal
- t is the time
∵ Jessica opened her account with $900
∴ P = 900
∵ Her account earns 2.3% simple interest yearly
∴ r = 2.3% = 2.3 ÷ 100 = 0.023
∵ Exactly a year and a half ago, she opened her account
∴ t = 1.5
- Substitute all of these values in the formula above
∵ I = 900(0.023)(1.5)
∴ I = 31.05
She has earned $31.05
Learn more:
You can learn more about the interest in brainly.com/question/11149751
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