Answer = 4MB
Block size = 4KB , Block address = 4B , Direct address = 10 , Single Indirect address = 1
No. of address per block = [no. of direct address + (Block size/block address) ]*4KB
= [10+(4KB/4B)]*4KB
= [10+1KB]*4KB =40KB + (2^10B * 2^12B ) =2^2 * 2^20B // 40KB is negligible w.r.t 4MB
= 4MB
OR
if you do't want to neglect it then,
40KB+4MB = 40KB+4096KB = 4136KB