Keila travels from Singapore to Japan.
She wants to change 850 Singapore dollars ($) into Yen (¥).
The exchange rate in Singapore is $100 = ¥11600 and the exchange rate in Japan is ¥1 = $0.0086.
She claims that she will receive more if she changes the money in Singapore.
Justify if her claim is true.
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Worked solution

9

1. Find the amount of Yen received if she changes the money in Singapore.

In Singapore, $100=¥11600\char36{}100 = ¥11600.

For $850\char36{}850,
850÷100×11600=98600850 \div 100 \times 11600 = 98600
So she receives ¥98600¥98600.

2. Find the amount of Yen received if she changes the money in Japan.

In Japan, ¥1=$0.0086¥1 = \char36{}0.0086.

For $850\char36{}850,
850÷0.0086=98837.209…850 \div 0.0086 = 98837.209\ldots
So she receives about ¥98837¥98837.

3. Compare the two amounts and justify the claim.

Since
98837.209…>98600,98837.209\ldots > 98600,
the amount received in Japan is greater.

Answer

Changing in Singapore gives ¥98600¥98600, while changing in Japan gives approximately ¥98837¥98837. Hence her claim is not true; she will receive more if she changes the money in Japan.

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