Determine how much US dollars (US$) or Malaysian ringgit (MYR) Zikri and Cheong will get based on the following:

i. If US$1.00 = MYR3.80, Zikri wishes to change MYR1,000 into US$

ii. If US$1.00 = MYR3.80, Cheong wishes to convert US$500 into MYR