



 
Hi Ruby, 10% of $\$1500$ is $0.10 \times \$1500 = \$150$ and since both of the GST amounts you have are more that $\$150$ the items purchased must have cost more than $\$1500.$ Suppose the GST paid had been $\$450.$ Think of the purchase happening in two steps. Step 1:
Step 2:
You paid $\$1500 + \$R.$ Now try your problem,  


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