A supermarket earns 5½% as discount on the total purchasing value and a bonus of ½% on sales more than Rs.10,000. What is the total sale value if it earns Rs.1,990?

Rs.34,000

Let total sales = 100x

Given :- 

Discount = 5.5%

And bonus on sales more than 10000 = 0.5%

i.e. 0.5% on ( 100x - 10000 )

\(\frac{5.5}{100}\) × 100x + \(\frac{0.5}{100}\) (100x - 10000) = 1990

5.5x + 0.5x - 50 = 1990

6x = 2040

x = \(\frac{2040}{6}\) 

x = 340

100x = 34000

So , total sales are 34000