Naomi got an email inviting her to join a fan club for her favorite singer. The fan club costs $7.50 a week. She decided not to join. How much will she save after a year?
There are 52 weeks in a year, so Naomi will save $7.50 x 52 = $<<7.5*52=390>>390 after a year. Answer: \boxed{390}.
Lavinia bought a 1,000 ounces of silver when the price was $33 an ounce. Recently the price was $22 an ounce. How much less is Lavinia's silver worth than when she bought it?
The value of the silver when Lavinia bought it was $33/ounce x 1000 ounces = $<<33*1000=33000>>33,000.
The current value of the silver is $22/ounce x 1000 ounces = $<<22*1000=22000>>22,000.
The silver is worth $33,000 - $22,000 = $<<33000-22000=11000>>11,000 less than when she bought it. Answer: \boxed{11000}.
Rinaldo bought a new car for $52,000 a year ago. A new car normally loses 20% of its value after one year. What is rinaldo's car worth now?
Rinaldo's car loses 20% of its value after one year, so it is worth 100% - 20% = 80% of its original value.
80% of $52,000 is (80/100) x $52,000 = $41,600.
Therefore, Rinaldo's car is worth $41,600 now. Answer: \boxed{41600}.