stuck on this qst

[lacoste]

13 Jenny received $1400 interest after she invested a sum of money for a year in two separate
accounts: one receiving 4% per annum interest and the other receiving 6% per annum
interest. Iriana, her friend, calculated that if Jenny had interchanged the two amounts that
she had invested, Jenny would have received $200 more in interest.
(a) If Jenny deposited x dollars and y dollars in the two accounts, write an equation for
her initial investment.
(b) Write an equation for the investment that Iriana referred to.
(c) How much money in total did Jenny have invested in the two accounts?
(d) Calculate the interest Jenny would receive if she invests the sum of money for one
year in a single account receiving 5% per annum interest.

I could get a and b but not c or d

[lacoste]

dont worry i figured it out .