Perfume is sold in two different sizes of bottle. The 80ml bottle is priced at £55.

The 50ml bottle is usually priced at £45 but is on special offer. If you buy one 50ml bottle of perfume, you can get a second for half price.

By calculating the price per ml, determine which offers the best value for money

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.