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12-06-2022
Mathematics

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Petra invests $10 800. After 4 years she has earned $3240 in interest. At what amount rate of interest did she invest her money?

Respuesta :

foj227175 foj227175

12-06-2022

Answer:

7.5%

Step-by-step explanation:

Let, rate be r%

Now,

interest=prt/100

3240= 10800×4×r/100

r=3240×100/10800×4

r=7.5%

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