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PLEASE HELP! WILL GIVE BRAINLIEST



1# Janet put $580 into a savings account for one year. The rate of interest on the account was 6½%. How much was the interest for the year in dollars and cents? (Round to the nearest cent)




2# Jeans Plus has a sign that says if you buy 3 pairs of jeans, you get $10 off the total regular price. The regular price is $25 per pair. Jeans Junction is selling jeans at 15% off the regular price. The regular price is also $25 per pair. Would you save more money shopping at Jeans Plus or Jeans Junction if you buy 3 pairs of jeans?

Respuesta :

MrsStrong

Answer:

1. $37.70 of interest

2. Jeans Junction

Step-by-step explanation:

1. For simple interest, we use the equation [tex]A=P(1+rt)[/tex] where

  • P is the principle or starting value
  • A is the total amount after interest and a period of time
  • r is the rate at which interest gathers as a decimal
  • t the time in years.

For this problem, we know P=$580, r=6.5%=0.065, t=1 year. We substitute into the formula and simplify to find the total amount A.

[tex]A=P(1+rt)\\A=580(1+0.065(1))\\A=580(1+0.065)\\A=580(1.065)\\A=617.70\\[/tex]

Using this total amount we can subtract the original principle to find the amount of interest.

617.7-580=$37.70 of interest

2. Jeans Plus sells jeans for $25 a pair At regular price, if I bought 3 I would spend 3j=s(25)=$75 and then received $10 off. SO I would spend $65 total.

Jeans Junction also sells jeans for $25 and will give me 15% off. This means I would pay 85% or 0.85 of the price (100-15=85). So if I buy 3, I would spend 3j=3(250=75. Then I can multiply 75(0.85)=63.75. This is the better deal because I spend less.

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