How can the Federal Reserve influence the interest rate on credit cards? A. By adjusting the discount rate banks pay to borrow money
B. By setting up federal credit card companies with low rates
C. By shutting down credit card companies that set rates too high
D. By raising taxes on companies that provide high-interest credit cards​

C. By adjusting the discount rate banks pay to borrow

Step-by-step explanation:

Most credit cards have variable interest rates, and they're tied to the prime rate, or the rate that banks charge to their preferred customers with good credit. ... In other words, when the Fed lowers or raises its benchmark interest rate, the prime rate typically falls or rises with it.

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let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt