Let Rathin babu deposited ₹ x for his 1st daughter (13 yrs old) and he deposited ₹ y for his 2nd daughter ( 8 yrs old).
When his 1st daughter will be 18 yrs, old i.e., after (18 – 13) =5 years
Her amount = x+\frac{x × 5 × 10}{100}=120000
or, \frac{10 x × 5 x}{10}=120000
or, 15 x = 120000 × 10
or, x=\frac{1200000}{15}=80,000
When his 2nd daughter will be 18 years old, i.e., after (18 – 8) = 10 years
\text { Her amount }=y+\frac{y × 10 × 10}{100}=2 y \\
\therefore 2y = 120000
y = 60000