Why is there a debt? Find the value of the following. Prove it

A man arranges to pay off a debt of Rs. 12000 in 30 annual instalments which form an A.P. When 20 of the instalments are paid, he dies leaving a half of the debt unpaid. Find the value of the first instalment.

A man arranges to pay a debt of Rs 3600 in 40 monthly installments which are in AP When 30 installments are paid he dies leaving one third of the debt unpaid Find the value of the first installment

A man arranges to pay a debt of Rs 3600 in 40 monthly installments which are in AP When 30 installments are paid he dies leaving one third of the debt unpaid Find the value of the first installment

A man arranges to pay a debt of Rs 3600 in 40 monthly installments which are in AP When 30 installments are paid he dies leaving one third of the debt unpaid Find the value of the first installment

Aman arranges to pay a debt of $90000 in 40 monthly instalments which are in A.P. when 30 instalments are paid, he dies leaving one third of the debt unpaid. Find the value of the first three instalments.

A man arranges to pay off a debt of 3,600 in 40 annual instalments which form an AP. When 30 of the instalments are paid, he dies leaving one-third of the debt unpaid. Find the value of the first instalment.

Bad debts mean which of the following ?

A man arranges to pay off a debt of Rs.3600 by 40 annual installments which form an arithmetic series.When 30 of the installments are paid,he dies leaving one-third of the debt unpaid; find the value of the first installment