Given, Ramesh earns = Rs. 28000 per month
His wife Rama earns = Rs. 36000 per month
Total earning = Ramesh's earning + Rama's earning
= Rs. (28000 + 36000) = Rs. 64000 per month (1 mark)
(a) Ratio of Ramesh's earning to their total earning = Rs.28000Rs.64000
= 716=7:16 [on dividing numerator and denominator by 4000] (1 mark)