Shares $1,000$

requirement $30\%$

Initial margin requirement $50\%$

Maintenance margin $30\%$

You shorted a stock at $$30$ a share. The next day, the Fed raised the initial margin requirement to $60\%.$ How much additional money would you need to deposit?

a none of the answers is correct

b $0$

c $$3\mathrm{.}000$

d $$300$