Seconds. How long did it take her to swim the whole race?The thickness of a mattress is 7.5 cm and that of another mattress is 9.75 cm. What wouldbe the thickness of two mattresses together when placed one on the top of the other?​

S.P. of the T.V. set = Rs.6800

Loss = 15%

(i) ∴ C.P. = (S.P. × 100)/(100 – Loss%)

= Rs.(6800 ×100)/(100 – 15)

= Rs.(6800 ×100)/85

= Rs. 8000

(ii) In second case, gain = 12%

∴ S.P. = {C.P.(100 + gain%)}/100

= Rs. {8000(100 + 12)}/100

= Rs. (8000 × 112)/100

= Rs. 8960