2. a man needed money to buy lawn equipment. he borrowed $800.00 for 7 months and paid $53.94 in interest. what was the rate of interest?

The rate of interest is 11.558% per annum paid simply.

Step-by-step explanation:

Using the formula of simple interest we have

where

S.I = simple interest

P = Principal amount deposited

r = interest rate

t = time period for which the principal amount is deposited.

Applying values in the above expression we get

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional