Question

shikhas income is 60% more than that of shalu. By what % is shalu's income less than shika's

Answer 1

Of course, 60%
as you say that Shikha has income is 60% more than Shalu so the ans would be same

Answer 2

of course 60% because shiksha income 60% more than that oth shaku then shaku income 60%less than shikha