Working : NZ $ : Bid = 1/0.4667 = 2.1427

NZ$ : Ask = 1/0.4660 = 2.1459

SG$ : Bid = 1 / 0.5710 = 1.7513

SG$ Ask = 1 / 0.5705 = 1.7528

Answer (b):

Cross Currency for SG$ priced in NZ$

BID = NZ$(1.7513*0.4660)/SG$ = NZ$0.8161/SG$

Answer (c):

Cross Currency for SG$ priced in NZ$

ASK = NZ$(1.7528*0.4667)/SG$ = NZ$0.8180/SG$

Answer (d):

Sell 2000 NZ$ to $ :

= 2000 * 0.4660

= $932

SELL 1500 SG$ to $ :

=1500 * 0.5705

= 855.75 or 856

Total $ Received = $932+$856 = $1788

Answer (e):

BUY 1000$ by selling SG$:

SG$ needed = 1000 / 0.5705 = 1752.85 or 1753 SG$

Alternative : 1000 * 1.7528 = 1752.8 or 1753 SG$

please see the attached file for complete solution