exam Maths Puzzle Numerical Ability

It is estimated that at the present rate of deforestation in El Salvador, in 20 years only 53% of the present forest will remain. How long will it take to remove 95% of the forest?

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[2 + 1/(1-1/t)] / [ 2 - (3/1-1/t)] a company want to build a new office. They have budgeted monthly payments of $26,000 for 25 years at 7.8% interest, compounded monthly. How much can the company afford to borrow