exam Maths Puzzle Numerical Ability

The statement is use a proportion to solve each problem. Round your answer to the nearest tenth or to the nearest tenth of a percent. 45 is 75% of what number? Find 62% of 70? 5 is

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FIND THE SIMPLE INTEREST AND THE BALANCE OF THE ACCOUNT!

1. $1000 AT 3% FOR SIX MONTHS What is the determinant of:
2 3 0 0
0 -1 0 1
0 0 1 -1
0 0 -2 1

(All numbers are in a big bracket)
Thank you!