Solution:
Principal (P) = Tk. 5,000
Rate (R) = 10% per annum
Time (T) = 2 years

Simple Interest (SI):
SI = (P × R × T)/100
= (5000 × 10 × 2) / 100
= 100000/100
= Tk. 1000

Compound Interest (CI):
Amount (A) = P × (1 + R/100)T
= 5000 × (1 + 10/100)2
= 5000 × (1.1)2
= 5000 × 1.21
= Tk. 6050

∴ CI = A - P = 6050 - 5000
= Tk. 1050

∴ Difference between CI and SI = 1050 - 1000
= Tk. 50

Solution:
Principal, P = 1600 টাকা
Amount, A = 2304 টাকা
Time, n = 2 years
Rate, r = ?

We know,
A = P × (1 + r/100)n
⇒ 2304 = 1600 × (1 + r/100)2
⇒ (1 + r/100)2 = 2304/1600
⇒ (1 + r/100) = 48/40 [উভয়পাশে বর্গমূল করে]
⇒ 1 + r/100 = 6/5
⇒ r/100 = 6/5 - 1
⇒ r/100 = (6 - 5)/5
⇒ r/100 = 1/5
⇒ r = 100/5
∴ r = 20

∴ Interest rate 20%