A man invested Rs. 8000 in each of two schemes, A and B. Scheme A offers simple interest at a rate of 9% per annum for 3 years, while scheme B offers simple interest at a rate of 8% per annum for 4 years. What is the total interest (in Rs.) earned by the man from both schemes?

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**Solution:**

1. Calculate the simple interest from scheme A:
   - Principal, *P* = Rs. 8000
   - Rate of interest, *R* = 9% per annum
   - Time, *T* = 3 years

Using the simple interest formula:
   $$SI_A = \frac{P 	imes R 	imes T}{100} = \frac{8000 	imes 9 	imes 3}{100} = 2160$$

2. Calculate the simple interest from scheme B:
   - Principal, *P* = Rs. 8000
   - Rate of interest, *R* = 8% per annum
   - Time, *T* = 4 years

Using the simple interest formula:
   $$SI_B = \frac{P 	imes R 	imes T}{100} = \frac{8000 	imes 8 	imes 4}{100} = 2560$$

3. Find the total interest earned from both schemes:
   $$	ext{Total Interest} = SI_A + SI_B = 2160 + 2560 = 4720$$

**Answer:** Rs. 4720

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