A sum lent out at simple interest becomes rs4480 in 3 years and rs 4800 in 5years. find the rate of interest

rate = 4%

Step-by-step explanation:

SI = 4800 - 4480 = 320 for two years

For 1 year, it is 320/2 = 160

For 5 years, it is 160 * 5 = 800

Principal = Amount -SI

P = 4800 - 800 = 4000

SI = prt / 100

800 = (4000 * r * 5) / 1000

r = 800 * 100 / 4000 * 5

r = 4%

Rate of intrest = 4%

Step-by-step explanation:

Short forms

Simple intrest=SI                     Year= Y              Rate= r

SI= 4800-4480

   = 320

1 year= 320/2 = 160

5year= 160 x 5

        = 800

P= Amount-SI

P= 4800-800

= 4000

SI=PRT/100

800=(4000  X r X 5)/1000

r=800 x 100/4000 x 5

r= 4%

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