exam Maths Puzzle Numerical Ability

(Nine more than the product 4 and the number is 73). I am helping my niece and I am stumped, Help.....

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exam Other Question

46. A principal of $5000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate?
A) 1%
B) 1.5%
C) 2%
D) 2.5%
Thankyou so much for your valuable time!!! Graph each of the following equations, using the intercept method.

2x+3y=6