Good morning everyone plz solve it very urgent brainliest question
Answers
Step-by-step explanation:
Let P be the Principal and r be the rate of interest.
Since the principal amounts to 915 in 3 years, simple interest would be 915 - P
Similarly, Since the principal amounts to 945 in 4 years, simple interest would be 945 - P
915 - P = 3Pr/100, Since SI = Pnr/100, where n = 3.
945 - P = 4Pr/100, where n = 4.
3Pr = 91500 - 100P ----------------1
4Pr = 94500 - 100P ---------------2
Subtracting equation 1 from equation 2, we get
Pr = 3000
Substituting the value of Pr = 3000 in equation 2
4 * 3000 = 94500 - 100P
12000 = 94500 - 100P
100P = 82500
P = 825.
Principal Amount = Rs 825.
Check for the solution:
Substitute the value of P in Pr = 3000
r = 3000/825 = 3.636%
SI(3) = 3 * 3000 * 3.636 / 100 = 90
Amount after 3 years = 825 + 90 = Rs 915
Similarly, SI(4) = 4 * 3000 * 3.636 / 100 = 120
Amount after 4 years = 825 + 120 = Rs 945
Thus P = Rs 825 and r = 3.636%
mark as brainlest please