If the plant grows 7cm every 7 days then you simply have to add 7 for each time it goes up 4. For example from 4-8 it went up 4 therefore you add 7. 7+7= 14. Then you repeat the process for all other numbers
Answer: Harrison bought any answer higher than 5/8 pound or 62.5% of a pound. He has to have bought more than these two numbers. (they are equal one is a fraction one is a percent)