## ARITHMETIC FORMULAE ON DISCOUNT

1). Discount = marked price – selling price

2). Selling price = marked price – discount

3). Marked price = selling price + discount

4). Discount = marked price × discount rate/100

5). Selling price = MP(100-r)/100

6). Discount percent = r ×100/MP

7). If successive discount on marked price is n1% , n2% and n3% , then equivalent discount rate

= 100[1-(100-n1)/100][(100-n2)/100][(100-n3)/100]%

8). If anyone wants to earn R% profit after giving r% discount , then for this the marked price is

= CP(100+R/100-r) , CP = MP(100-r/100+R)

9). Single discount equivalent to two discount rates is = (r1+r2 -r1r2/100)%

10). If marked price and successive discount rates is given as MP and n1, n2 and n3, then the selling price is –

= MP(100-n1/100)(100-n2/100)(100-n3/100)

11). If selling price and successive discount rates are SP and r1% , r2% and r3% then the marked price is = SP×100×100×100/(100-r1)(100-r2)(100-r3)

12). After giving r% discount , if anyone wants to earn R% profit then the marked price of the object should be, much more than the cost price is =

100(r+R)/(100-r)

13). If anyone wants to give r1% discount , then the profit gained by him , after increasing the marked price with r% is = {[r(100-r1)/100] – r1}