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Baby010391
26.06.2019 •
Mathematics
Last year eduardo invested at 8% interest and his wife sofia invested some money at 9% interest.their total on two investment was $860.this year each dicided to invest the same amount of money as last year eduardo invested at 7% and sofia invested hers at 6%. if they receive a total of $640 interest how much money did each invest
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Ответ:
Eduardo invested $4000
Sofia invested $6000
Step-by-step explanation:
Let amount Eduardo invested be x
and amount Sofia invested be y. Then,
0.08x + 0.09y = 860 ⇒ 8x + 9y = 86000 (1) 0.07x + 0.06y = 640 ⇒ 7x + 6y = 64000 (2)
On solving equations (1) and (2) ,
We get , x = $4000 and substituting this value of x in (2), we get y = $6000
Hence, amount of money invested by each of them : Eduardo invested $4000 and Sofia invested $6000
Ответ:
LOL
Step-by-step explanation: