Section 6(3)(b) in Delhi and Ajmer Rent Control Act, 1952
(b)the tenant may lawfully increase the rent payable by the sub-tenant-(i)in the case of any premises let for residential purposes, by an amount not exceeding twenty-five per cent. of the standard rent of the part sub-let; and(ii)in the case of any premises let for other purposes, by an amount not exceeding fifty per cent. of the standard rent of the part sub-let;