Make Cell Result Copy Itself Into Subsequent Cells X Number Of Times?

Say I have (cell A1) 10 salespeople and they each sell a (A2) $100/month membership, so I have (A3) $1,000 monthly revenue.

(A4) is an assumption about how many months the average person will stay a member.

So if A4 = 6, (6 month membership assumption) how would I get Excel to output $1,000 (the result from A3) into cells B3 through B8

but then for instance if A4 = 3 (3 month membership assumption) it would only output the the $1,000 result from A3 into cells B3 through B5

So like A1 through A4 of...

10
$100
$1,000
6

would output $1,000 into B3 through B8

but

10
$100
$1,000
3

would output $1,000 only to B3 to B5