Cindy has $70,000 to invest and requires an overall rate of return of 9%. Sheinvests her money in one account at 8% while another in an account paying 12%.How much should be placed in each investment to achieve her goal?   I understand I=PRT, but I can't seem to get to an equation that I can comprehend.

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.