Question

find there ratio correctly .......
because I don't no answer correctly.. pls say which method you use ......

Answer 1

1 year
$1 \: year = 12 \: months$
$2.5yrs = 12 \times 2.5yrs = 30 \: months$
$for \: 4 \:months \: he \: pays \: 5200rupees \: then \: for \: 1month \: he \: pays5200 \div 4 = 1300 \: rupees$
$then \: for \: 30 \: months \: he \: will \: have \: to \: pay \: 1300 \times 30 = 39000 \: rupees$
Ans-Sandeep has to pay 39000 rupees for 2 .5 years .