-56 
is your answer
What is the percent of change if the price changes from $150 to $100? Round to the nearest whole percent if necessary.
1 answer:
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Set up a proportion:
y = 35 when x = 7
y = ? when x = 10
To get x from 7 to 10, you have to multiply by . Therefore, you do the same to 35, and you get:
And your answer is 50 :)