One-third of Ratan's investment in National Savings Certificate is equal to one-half of his investment in FDR. If he has Tk. 1,50,000 as total investment, how much he invested in savings certificate?

A Tk. 30,000

B Tk. 50,000

C Tk. 60,000

D Tk. 90,000

Correct Answer: Option D

দেওয়া আছে,
মোট Investment = 150000 টাকা

ধরি, National savings certificate -এ Investment = x টাকা

∴ FDR -এ Investment = (150000 - x) টাকা

প্রশ্নমতে, (1/3).x = (1/2).(150000 - x)
⇒ x/3 = (150000 - x)/2

⇒ 2x = 450000 - 3x

⇒ 2x + 3x = 450000

⇒ 5x = 450000

⇒ x = 90000

National saving certificate- এ Investment = 90000 টাকা