The sum of $360 becomes $540 in 9 years. What is the rate of simple interest for the first 4 years, if the rate of
simple int

2 thoughts on “The sum of $360 becomes $540 in 9 years. What is the rate of simple interest for the first 4 years, if the rate of<br />simple int”

1. Step-by-step explanation:

   Here,

   Amount= P+SI

   540= 360+SI

   SI= 540-360= 180

   so the sum of SI of 9 years= 180

   let x be the rate for the first 5 years,

   So,

   SI= p×r×t/100

   = 360×x×5/100

   = 3.6x × 5

   =18x

   and SI of another 4 years @6% per annum

   = p×r×t/100

   = 360×6×4/100

   = 3.6×6×4

   = 21.6×4

   = 86.4

   Now adding both SI with we have

   18x+86.4= 180

   18x= 180-84.6

   x= 95.4/18

   = 10.6/2

   = 5.3

   Therefore rate for the first 5 years= 5.3%

   Reply

2. Answer:

   So, interest for first four years = 180-108 = Rs. 72; Now, rate for first four years = (72*100)/360*4; = 5%.

   hope it helps you

   Mark me as brainlliest

   Reply