5.8  SELF TEST

 

1.Rohini requires Rs. 2500 after 12 weeks to send her daughter to school. She Saved Rs. 100 in the first week and increases her weekly saving by Rs. 20 every week . Find weather she will be able to send her daughter to school after 12 weeks . What value is generated in the above situation. ( 2 mk  )

2.Find the 60th term of the AP 8, 10, 12, …, if it has a total of 60 terms and hence find the sum of its last 10 terms. ( 2 mk  )

3.Find the 16th term of the AP : 2, 7, 12, . . . ( 1 mk  )

  1. Find the 20th term from the last term of the AP: 3, 8, 13, ……, 253. ( 2 mk )
  2. Given a =    5, d    =    3, an    =    50, find n and Sn. . ( 2 mk  )

6.A man arranges to pay a debt of Rs.3600 in 40 monthly instalments which are in a AP. When 30 instalments are paid he dies leaving one third of the debt unpaid. Find the value of the first instalment. . ( 3 mk  )

  1. Abdul buys a shop for Rs.1,20,000.He pays half the balance of the amount in cash and agrees to pay the balance in 12 annual instalments of Rs.5000 each. If the rate of interest is 12% and he pays with the instalment the interest due for the unpaid amount. Find the total cost of the shop. . ( 3 mk )
  2. Find the middle term of the AP 1, 8, 15….505. ( 2 mk )
  3. An Arithmetic Progression 5, 12, 19, … has 50 terms. Find its last term. Hence find the sum of its last 15 terms. ( 3 mk )