21. huixian's mother buys some shares of
company a on day 0. on day 7, the share price
of company a is $4.60. if she sells all her shares
of company a and buys 2000 shares of
company b on day 7, she would receive $7400.
on day 12, the share price of company a is
less than that on day 7. if she sells all her shares
of company a and buys 5000 shares of
$4.80 and the share price of company b is $0.50
company b on day 12, she would have to pay $5800.
find
(1) the number of shares of company a huixian's
mother has,
(ii) the share price of company b on day 12.