Verified answer

Step-by-step explanation:

According to question ,

Let Amount lent at 8% rate of interest = ₹ p

∴ Amount lent at

4% rate of interest = (20,000 – p)3

∴ SI = Principal × Time × Rate100

∴ p × 8 × 1+ (20000 - p) × ( 4/3 ) × 1

= 800

100 100⇒ 2p+ 20000 - p= 800

25 75

⇒ 6p + 20000 - p= 800

75

⇒ 5p + 20,000 = 75 × 800 = 60,000

⇒ 5p = 60,000-20,000 = 40,000

⇒ p = 40000 ÷ 5 = 8000