Birch:
2.5in/5mo=.5in/mo
Bean:
8in/10mo=.8in/mo
Rosebush:
5in/8mo=.625in/mo
Bean
16.2 + -8.4 = 7.8 is your Answer
220-220r=160
Solve for r to get the discount rate
r=0.2727
r=0.2727×100
r=27.27%
Check
220−220×0.2727
=160
If you want the ratio in its simplest form, then it’s already in its simplest form.