Question

John started a business in which he earned Rs.100 for the first day. Rs.500 on the second day. Rs.900 on the third day. Rs.1300 on the fourth day. and so on. What is his earning in day 1000?
A Rs. 399100
B Rs. 399700
C Rs. 400000
D Rs. 400500​

Answer 1

Answer:

option 2

Step-by-step explanation:

since there is a jump of 400 between the earnings of previous day and current day , therefore the expression we can derive upon observation is

(n x 400) - 300 where n is the day no.

so 1000th day earning will be

(1000 x 400) - 300

= 4000000 - 300

= 399700