what's the total amount to be paid back that's loan and interest on loan of 2000 naira for 3 weeks at 1naira on each 10 naira interest per week

The total amount to be paid back for a loan of 2000 naira for 3 weeks at 1 naira on each 10 naira interest per week would be:

Weekly interest: 2000 naira / 10 naira = 200 naira
Total interest for 3 weeks: 200 naira x 3 weeks = 600 naira

Total amount to be paid back: 2000 naira (loan) + 600 naira (interest) = 2600 naira

Therefore, the total amount to be paid back is 2600 naira.