What approximate value will come in place of question mark (?) in the following questionss (You are not expected to calculate the exact value).

449.99% of 19.87 + √530 × 3.77 = ?

A grocer has a sale of Rs.6635, Rs.7127, Rs.7055, Rs.7430 and Rs.6462 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs.6700? (In Rs.)

If 86% of a number is added to 350, then the result is the number itself. Find the number.

Rakesh spends 15% of his monthly income on his household expenditure, 20% on books, 30% on clothes and saves the rest. On counting, he comes to know that he has finally saved Rs.12565. Find his monthly income. (In Rs.)

If 20% of 340 is x less than 40% of 480, find x.