Final answer:
Jo should pay $900 for rent, which is 60% of his monthly income of $1500. The percent increase in the price of gas from $1.25 to $1.30 is 4%.
Step-by-step explanation:
If Jo estimates that 60% of his monthly earnings should pay for rent and his monthly income is $1500, the amount he should pay for rent can be calculated by multiplying 1500 by 0.60, which is $900.
For the second question, the percent increase in the price of gas from $1.25 to $1.30 can be calculated by subtracting the old price from the new price, then dividing by the old price and multiplying by 100. So the increase is (($1.30 - $1.25) / $1.25) * 100 = 4%.