Mary is planning to buy a mobile phone that costs $500. a salesperson at the store informs her about four different installment plans that she can choose from.

plan a: a down payment of $50 and monthly payments of $40 for 12 months
plan b: a down payment of $100 and monthly payments of $80 for 6 months
plan c: no down payment and monthly payments of $60 for 12 months
plan d: no down payment and monthly payments of $100 for 6 months

which plan will have the highest finance charge?

d. is the correct answer

step-by-step explanation:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

3

step-by-step explanation:

b.

step-by-step explanation:

i just know