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The table below shows commission charged on postal orders.
Mary was to send sh 7000 using postal orders. Which one of the following combination of value of orders shows the least commission she would be charged?
A. Sh 4000, sh 1000, sh 1000 and sh 1000
B. Sh 3000, sh 3000 and sh 1000
C. Sh 4000 and sh 3000
D. Sh 2000, sh 2000, sh 2000 and sh 1000