Please answer the question below and give the explanation. I don't really need the answer.
Read the statements carefully and state 'T' for true and 'F' for false.
(i) If an investment triples itself in 30 years, then the rate of simple interest is per annum.
(ii) The ratio of simple interest earned of certain amount at the same rate of interest for 6 years and that for 9 years is 3 : 4.
(iii) A pair of articles was bought for ₹ 37.40 at a discount of 15%. The marked price of each article was ₹ 22.

(i) (ii) (iii)
A T T F
B T F T
C F T T
D T T T