Gondor is a technician, he earns $10 from repairing a phone and $20 from repairing a laptop. If he was able to repair 3 phones last Monday, 5 phones last Tuesday, 2 laptops on Wednesday, and 4 laptops last Thursday, how much does he earn in total?
Gondor was able to repair a total of 3+5= <T>add(3, 5)=8 phones from Monday to Tuesday.
And the total amount he earned is $10x8= $<T>multiply(10, 8)=80
He was able to repair a total of 2+4= <T>add(2, 4)=6 laptops from Wednesday to Thursday.
So, the total amount he earned is $20x6= $<T>multiply(20, 6)=120
Therefore, the total amount he earned is $120+$80= $<T>add(120, 80)=200
