TCS Company Numerical Ability Profit and Loss

a groccer was selling oranges a a penny each, olives at 2

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TCS Other Question

19.If f(x) = sum of all the digits of x, where x is a natural number, then what is the value of f(101)+f(102)+f(103)+ .. +f(200)?
Option 1 : 1000 Option 2 : 784 Option 3 : 999 Option 4 : 1001

A, B and C can do a piece of work in 20, 30 and 60 days
respectively. In how many days can A do the work if he
is assisted by B and C on every third day?