A process is learning at a $92\%$ rate. The first unit required $70$ minutes. How many units

must be processed before the company cuts the processing time to $28$ minutes?

between $2,000$ and $2,100$ units

between $2,500$ and $2,600$ units

between $1,700$ and $1,800$ units

between $1,000$ and $1,100$ units

none of the above is correct.